考研英語完型填空練習題及答案（通用5套）
在學習、工作生活中，我們最不陌生的就是練習題了，只有多做題，學習成績才能提上來。學習就是一個反復反復再反復的過程，多做題。一份好的習題都是什么樣子的呢？下面是小編收集整理的考研英語完型填空練習題及答案，供大家參考借鑒，希望可以幫助到有需要的朋友。
考研英語完型填空練習題及答案 1
About 40 percent of Americans think of themselves as shy, while only 20 percent say they have never suffered from shyness at some point in their lives. Shyness occurs when a person’s apprehensions are so great that they 1 his making an expected or desired social response. 2 of shyness can be as minor as 3 to make eye contact when speaking to someone, 4 as major as avoiding conversations whenever possible.
“Shy people tend to be too 5 with themselves,” said Jonathan Cheek, a psychologist, who is one of those at the forefront of current research on the topic. “ 6 , for a smooth conversation, you need to pay attention to the other person’s cues 7 he is saying and doing. But the shy person is full of 8 about how he seems to the other person, and so he often 9 cues he should pick up. The result is an awkward lag in the conversation. Shy people need to stop focusing on 10 and switch their attention to the other person.”
11 , shy people by and large have 12 social abilities than they think they do. 13 Dr. Cheek videotaped shy people talking to 14 , and then had raters (評估者) evaluate how socially skilled the people were, he found that, in the 15 of other people, the shy group had few 16 problems. But when he asked the shy people themselves 17 they had done, they were unanimous in saying that they had been social flops (失敗).
“Shy people are their own 18 critics,” Dr. Cheek said. 19 he added, shy people feel they are being judged more 20 than they actually are, and overestimate how obvious their social anxiety is to others.
1. [A] prevent[B] inhibit[C] keep[D] motivate
2. [A] Symptoms[B] Signals[C] Highlights[D] Incidences
3. [A] succeeding[B] failing[C] acting[D] responding
4. [A] but[B] not[C] or[D] nor
5. [A] preoccupied[B] absorbed[C] engaged[D] indulged
6. [A] However[B] Then[C] For example[D] Instead
7. [A] that[B] which[C] what[D] how
8. [A] worries[B] feelings[C] emotions[D] indiffferences
9. [A] follows[B] picks up[C] misses[D] catches
10.[A]the conversation[B] shyness[C] others[D] themselves
11. [A] Therefore[B] Nevertheless[C]On the contrary[D] Similarly
12. [A] worse[B] as good[C] better[D] best
13. [A] When[B] Since[C] While[D] As
14. [A] themselves[B] friends[C] strangers[D] others
15. [A] name[B] terms[C] ease[D] eyes
16. [A] oblivious[B] obvious[C] oblique[D] obscure
17. [A] what[B] whatever[C] how[D] however
18. [A] best[B] justice[C] fair[D] worst
19. [A] In particular[B] In contrast[C] In general[D] In comparison
20. [A] positively[B] negatively[C] subjectively[D] objectively
參考答案
1. 【答案】B
【解析】 inhibit意為“阻止，抑制”，后面可直接跟名詞或動名詞，如：Thirst inhibits the desire to eat.口渴妨礙食欲。而prevent，keep雖也意為“阻止”，但常用結構為prevent/keep sb.from doing sth.因此這里inhibit為最佳選項。
2. 【答案】A
【解析】symptom意為“癥狀，病癥”，在文中的意思是“害羞的癥狀就是……”。
3. 【答案】B
【解析】fail to do sth.不能做某事，句意為：害羞的人不能在與別人交談時與別人進行眼神交流。因此，B項最合邏輯。
4. 【答案】C
【解析】or表示一種選擇關系，根據上句...can be as minor as. . .，“可能微小到……”，又根據后面的as major as...，“能大到……”，由此可知應是一種選擇關系，因此用or。
5. 【答案】A
【解析】preoccupied意為“心事重重的;關注于……的”，此句意為：害羞的人趨于對他們自己過分關注
6. 【答案】C
【解析】因為前面提出一個觀點，害羞的人往往過分關注自己，這里便舉例證明這個觀點，因此C項為最佳選項。
7. 【答案】C
【解析】注意前面出現的cues，這個詞意為“(言詞、行為之)暗示，提示”。因為后面一句是用來解釋說明cues的，因此應選What he is saying and doing.他在說什么話和做著什么動作。
8. 【答案】A
【解析】根據前面提出的觀點，應知此句意為：害羞的人過分擔心自己在他人眼中是什么樣的，他們為自己的形象憂心重重。因此，選用worries最合文意。
9. 【答案】C
【解析】此句意為：正因為害羞的人過分關注他人對自己的看法，往往會錯過別人的話語和小動作。根據文意，miss最合文意。
10. 【答案】D
【解析】前面提到，害羞的人是趨于關注“自己”的，因此，此處應選用themselves。
11. 【答案】B
【解析】根據后一句，害羞的人的'社交能力往往比他們自己想的要強，與前文談害羞的人的缺點相比，可知這里有一個轉折語氣，nevertheless可引起轉折語氣，相當于but。
12. 【答案】C
【解析】此句意為：害羞的人有著比他們所想象的要強的社交能力。
13. 【答案】A
【解析】這里需要的是一個引導時間狀語從句的詞，句意為：當Cheek博士攝下害羞的人與他人談話的情景時。
14. 【答案】C
根據邏輯，選擇strang
er，與陌生人談話為最佳選項。
15. 【答案】D
【解析】in the eyes of sb.意為“在某人看來”;in the name of sb.意為“以某人的名義”。根據上下文，選用eyes最合邏輯。
16. 【答案】B
【解析】obvious意為“可看出來的，顯而易見的”;oblivious意為“”忘卻”;obscure意為“模糊的”;oblique意為“間接的，斜的”。
17. 【答案】C
【解析】根據上下文，此句意為：研究者問了別人對害羞者行為的評價后，又問他們自己覺得自己表現怎么樣。因此選用how最合適。
18. 【答案】D
【解析】根據前文，害羞者總是覺得自己表現不好，因此選用worst，句意為：害羞的人是對他們自己評論最差的人。
19. 【答案】C
【解析】in general意為“總體上來說”;in particular意為“具體而言”;in contrast意為“相比而言”;in comparison意為“比較地說”。
20. 【答案】B
【解析】negatively意為“否定地，消極地”;positively意為“肯定地”;subjectively意為“主觀地”;objectively意為“客觀地”。此題句意為：害羞的人趨于對自己有否定的評價。應選B項。
考研英語完型填空練習題及答案 2
Things in the henhouse changed practically overnight when McDonald’s announced in 1999 that it would no longer buy eggs from producers who didn’t meet its guidelines for care of chickens. Those guidelines included limiting the 1 of birds that could be kept in one 2 and prohibiting beak removal, 3 trimming just the tips.
Once McDonald’s had 4 the way in issuing animal care guidelines for the company’s suppliers, many other giants of the fast-food industry rapidly followed 5 , including Burger King, Taco Bell, Pizza Hut, Wendy’s, A and W and KFC. Now, the American Meat Institute has 6 welfare guidelines and audit 7 for cattle, pigs, and chickens. And the European Union, representing our foreign customers, is also 8 in with, among other things, legislation banning. 9 use of crates to house pregnant sows, 10 in 2013.
Questions about animal care 11 with the explosive growth in large-scale livestock farms, 12 spurred customers to complain about animals being treated as “factory parts”. That spurred ARS and the livestock industry to take a proactive approach to addressing animal 13 issues, making sure that guidelines are based on facts 14 through scientific research. The goal is to share research findings with the retail food industry and others so that the livestock industry can improve its 15 guidelines.
Ten years ago, to 16 these concerns, ARS started a research program on livestock behavior and stress. The scientists involved were tasked with finding out whether modern farming practices were 17 stressing animals. And if so, could scientific methods be developed to measure this stress so that 18 could be evaluated objectively rather than subjectively?
A decade later, the 19 answer is “yes” to both questions, Many had expected the answer to be “no” on both counts, but science works independently 20 people’s opinions.
1. A. amount B. number C. figure D. sum
2. A. cage B. cave C. case D. cart
3. A. but for B. except for C. aside from D. away from
4. A. paved B. changed C. led D. opened
5. A. suitB. step C. set D. super
6. A. adapted B. adopted C. approved D. accepted
7. A. booklets B. pamphlets C. brochures D. checklists
8. A. measuring B. weighing C. considering D. thinking
9. A. prolonged B. proceeded C. programmed D. progressed
10. A. efficient B. effective C. effusive D. elective
11. A. raised B. roseC. aroseD. pose
12. A. who B. what C. which D. how
13. A. health B. life C. wealth D welfare
14. A. decided B. determined C. proved D. tested
15. A. voluntary B. revolutionary C. preliminary D. necessary
16. A. express B. address C. suppress D. compress
17. A. unduly B. unequally C. unfortunately D. unfavorably
18. A. performances B. programs C. problems D. practices
19. A. sequential B. initial C. essential D. financial
20. A. of B. on C. by D. with
1.【答案】B
【解析】amount指不可數名詞的“數量”，number指可數名詞的“數目”，figure指一個“數字”，sum多指錢的“數量”。這里指家禽數目，是可數名詞，因此答案是B。
2.【答案】A
【解析】cage意為“籠子”，是和文中的bird搭配唯一恰當的詞，cave“洞穴”，case“箱子”和cart“人力車”都不可和bird搭配使句意通暢，所以選A。
3.【答案】B
【解析】but for是“若非，要不是”，except for是“除了，只是”，aside from是“除…以外”，away from是“離開”。原文的意思是供應商除了可以對鳥喙尖部稍加修剪外禁止去掉鳥喙。只有except for符合句子意思，因此B是正確答案。
4.【答案】C
【解析】pave the way是“為…作準備”，change the way是“改變…方式、方法”，lead the way是“為…之先，首先倡導”，open則不能和the way搭配。根據上下文可知麥當勞公司在家禽飼養方面率先作出明確規定，其后諸多快餐巨頭紛紛效仿，因此答案是C。
5.【答案】A
【解析】“效仿，模仿”在英語里的固定短語是follow suit，所以選A。
6.【答案】B
【解析】adapt是“適應”，adopt是“采納”，approve是“同意”，accept是“接受，同意”。首先排除adpat，而approve和accept意思相近，屬于干擾選項，所以答案是B。提醒大家準確記憶adapt和adopt的拼寫及用法，這兩個詞在詞匯測試方面的出現頻率相當高。
7.【答案】D
【解析】本題我們可以采用排除法。A、B、C三個選項都是“小冊子”的意思，不能同時成為正確答案，只能選D，checklist的意思是“(核對用的)一覽表(尤指完整的清單)”。
8.【答案】B
【解析】weigh in with是固定短語，意為“(在討論等中)有把握地提出”。Consider，think和measure都不能和in with搭配，所以答案是B。
9.【答案】A
【解析】這四個選項相似之處在于它們有相同詞頭“pro”。prolong的意思是“拖延，延長”，
proceed的意思是“進行，繼續”，program為“設計，規劃”之意，而progress則為“進步，發展”之意。只有prolong的`過去分詞能修飾use，因此只能選擇A。
10.【答案】B
【解析】C，D選項易排除，effusive為“感情橫溢的，流出的”，elective意思是“有選舉權的，被選任的，可選修的”。A、B選項也是考試高頻詞匯，它們不僅拼寫相似，意思也有相近之處，effective意思是“生效的，有效的”，而efficient是“效率高的，能干的，有效的”之意，法律條文的生效一般用effective，所以選B。
11.【答案】C
【解析】本句主干是“Questions+待選謂語動詞”，意思是伴隨著大規模家畜飼養場的發展出現了許多問題。我們先排除raised和posed，因為它們與question搭配時都作及物動詞。rise為“升起，增長”之意，arise的意思是“出現，發生”，只有arise能作不及物動詞和question搭配，因此C為正確答案。
12.【答案】C
【解析】解這道題時，首先要理清句子結構。逗號后面的句子應為非限制性定語從句，修飾前面整句話，待選詞應為引導定語從句的關系代詞，據此可排除what和how，又因為這個定語從句修飾的不是人，who也被排除。正確答案只能為C.
13.【答案】D
【解析】health是“健康”，life是“生命，生存”，wealth是“財富”，welfare是“福利”。從上文可以看出，本文討論的是針對動物的福利提出的一些飼養動物的規定，因此D是正確答案。
14.【答案】B
【解析】decide是“決定，使下決心”，determine是“決定，確定，測定”，prove是“證明，證實”，test是“試驗，測驗”。要填的過去分詞修飾的是fact，最合適的選項是determined，因此答案是B。
15.【答案】A
【解析】voluntary意思是“自發的，自愿的”，revolutionary為“革命的”，而preliminary為“預備的，初步的”，necessary則為“必須的，必需的”。從上文可以看出，這些guidelines(指導原則)是由家畜飼養行業自發制定的，而與食品零售行業和其他行業共享研究結果的目的是完善這些指導原則，因此A為正確答案。
16.【答案】B
【解析】express是“表達，表示”，address是“對付，處理”，suppress是“壓制，鎮壓”，compress是“壓縮，鎮壓”。express和address能和concerns搭配，但這句話的主語是ARS，不定式短語表示目的，即ARS開始實驗的目的，顯然address更合適，所以選B。
17.【答案】A
【解析】大家可用構詞法知識對詞義進行推測，duly為“適當地”，那么unduly應為“不適當地，過分地”之意，其他三個選項也可依此類推。根據句子意思判斷，A為正確答案。原句意思是科學家想通過研究來驗證現代的飼養方式是否對家畜形成過大的壓力。
18.【答案】D
【解析】 performance是“表演，表現”，program是“規劃，程序”，problem是“問題”，practice是“實踐，行為，做法”。除了區別四個選項的意思之外，細心的同學會發現上句話中practice已經出現。從上下文中尋找正確答案是做完形填空題非常行之有效的技巧。D是正確答案。
19.【答案】B
【解析】sequential是“連續的”，initial是“最初的”，essential是“必不可少的”，financial是“金融的”。空格后搭配的是answer，A、C、D三個選項都可以排除，因此選擇B。
20.【答案】A
【解析】 be independent of是固定短語，意為“不依賴于…”，原句意思是科學不以人的意志為轉移，也就是說科學不依賴于人為因素。正確答案為A。
考研英語完型填空練習題及答案 3
Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is ___1___ only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, ___2___ embarrassed. You have to take a commuter train any morning or evening to ___3___ the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. ___4___, there is an unwritten but clearly understood code of behavior which, ___5___ broken, makes the offender immediately the object of ___6___.
It has been known as a fact that the a British has a ___7___ for the discussion of their weather and that, if given a chance, he will talk about it ___8___. Some people argue that it is because the British weather seldom ___9___ forecast and hence becomes a source of interest and ___10___ to everyone. This may be so. ___11___ a British cannot have much ___12___ in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong ___13___ a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate――or as inaccurate――as the weathermen in his ___14___.
Foreigners may be surprised at the number of references ___15___ weather that the British make to each other in the course of a single day. Very often conversational greetings are ___16___ by comments on the weather. "Nice day, isn"t it?" "Beautiful!" may well be heard instead of "Good morning, how are you?" ___17___ the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. ___18___ he wants to start a conversation with a British but is ___19___ to knowswheresto begin, he could do well to mention the state of the weather. It is a safe subject which will ___20___ an answer from even the most reserved of the British.
1. A. relaxed B. frustrated C. amused D. exhausted
2. A. yet B. otherwise C. even D. so
3. A. experience B. witness C. watch D. undergo
4. A. Deliberately B. Consequently C. Frequently D. Apparently
5. A. unless B. once C. while D. as
6. A. suspicion B. opposition C. criticism D. praise
7. A. emotion B. fancy C. likeliness D. judgement
8. A. at length B. to a great extent C. from his heart D. by all means
9. A. follows B. predicts C. defies D. supports
10. A. dedication B. compassion C. contemplation D. speculation
11. A. Still B. Also C. Certainly D. Fundamentally
12. A. faith B. reliance C. honor D. credit
13. A. if B. once C. when D. whereas
14. A. propositions B. predictions C. approval D. defiance
15. A. about B. on C. in D. to
16. A. started B. conducted C. replaced D. proposed
17. A. Since B. Although C. However D. Only if
18. A. Even if B. Because C. If D. For
19. A. at a loss B. at last C. insgroups D. on the occasion
20. A. stimulate B. constitute C. furnish D. provoke
參考答案
1. A 2.C 3.B 4.D 5.B 6.C 7.B 8.A 9.A 10.D
11. C 12.A 13.C 14.B 15.D 16.C 17.B 18.C 19.A 20.D
考研英語完型填空練習題及答案 4
Here is another program in the series, "Famous Personalities (個性)." This afternoon I am going to talk (1)____ the famous film director, Daniel Z. Sloman. Dan Sloman doesn’t need any introduction from me. He has directed "Goodbye to Boston", "Pacific Story" and many other famous films. "Tell me, Dan, have you ever directed a film in England?"
"Why, yes, Peter. I directed ’Green Years’ here."
"Oh course. How long (2)____ was that, Dan?"
"That was five years ago. That film was about life in an English village."
"What can you remember about this (3)____, Dan?"
"Lots of things, Peter. When we were filming in the open, it usually (4)____ to rain!"
"You rebuilt half the village, I believe, Dan."
"That’s right, Peter. We built a (5)____ over the river. We put a few buildings. (6)____ our men were working, half the (7)____ watched us."
"Were the villagers against the film?"
"Oh, no. Many villagers (8)____ a lot of money. Thousands of tourists came to the village. The place (9)____ famous."
"Have you ever been back to the village since then?"
"I can’t say I have, Peter. But I remember it well."
"What else do you remember about the film, ’Green Years’, Dan?"
"Well, I remember the actors, of course. In one scene we (10)____ a thousand ’extras’."
"And you used the villagers."
"That’s right, Peter. There were 2000 men, women and children in the village and we used a thousand of them. Every man has his price. We paid each villager fifty pence to take part in the film."
"What about the villagers that weren’t in the film?"
"They came to watch."
"What happened then?"
"It was very funny, Peter. We couldn’t keep them out of it. We paid half the villagers fifty pence each to act in the film. And we paid the other half of the villagers five pounds each not to join in the film! But it was a great scene. I’ll never forget it."
"Thank you, Dan."
1. A. to B. about C. for D. into
2. A. before B. ago C. after D. since
3. A. life B. village C. year D. film
4. A. begins B. began C. had started D. beginning
5. A. road B. way C. village D. bridge
6. A. As soon as B. After C. Before D. While
7. A. town B. city C. village D. country
8. A. made B. took C. carried D. brought
9. A. is B. gets C. became D. get
10. A. asked B. dismissed C. needed D. told
答案：1. A 2. B 3. D 4. B 5. D 6. D7. C 8. A 9. C 10. C
考研英語完型填空練習題及答案 5
A land free from destruction, plus wealth, natural resources, and labor supply—all these were important 1 in helping England to become the center for the Industrial Revolution. 2 they were not enough. Something 3 was needed to start the industrial process. That "something special" was men—4 individuals who could invent machines, find new 5 of power, and establish business organizations to reshape society.
The men who 6 the machines of the Industrial Revolution 7 from many backgrounds and many occupations. Many of them were 8 inventors than scientists. A man who is a 9 scientist is primarily interested in doing his research 10 .He is not necessarily working 11 that his findings can be used.
An inventor or one interested in applied science is 12 trying to make something that has a concrete use. He may try to solve a problem by 13 the theories 14 science or by experimenting through trial and error. Regardless of his method, he is working to obtain a 15 result: the construction of a harvesting machine, the burning of a light bulb, or one of 16 other objectives.
Most of the people who 17 the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had 18 or no training in science might not have made their inventions 19 a groundwork had not been laid by scientists years 20 .
1.A.cases B.reasons C.factors D.situations
2.A.But B.And C.Besides D.Even
3.A.else B.near C.extra D.similar
4.A.generating B.effective C.motivating D.creative
5.A.origins B.sources C.bases D.discoveries
6.A.employed B.created C.operated D.controlled
7.A.came B.arrived C.stemmed D.appeared
8.A.less B.better C.more D.worse
9.A.genuine B.practical C.pure D.clever
10.A.happily B.occasionally C.reluctantly D.accurately
11.A.now B.and C.all D.so
12.A.seldom B.sometimes C.all D.never
13.A.planning B.using C.idea D.means
14.A.of B.with C.to D.as
15.A.single B.sole C.specialized D.specific
16.A.few B.those C.many D.all
17.A.proposed B.developed C.supplied D.offered
18.A.little B.much C.some D.any
19.A.as B.if C.because D.while
20.A.ago B.past C.ahead D.before
1.【答案】C
【解析】從這四個詞的意思上來區分，case是“事例，案例”的意思，reason表原因，factor意為“因素”，situation的意思是“形勢，狀況”，文中句子的意思是上述條件是使英國成為工業革命中心的重要因素。故選C.factor。
2.【答案】A
【解析】根據上下句的意思，應選一個表轉折的連詞，只有A.but符合題意。
3.【答案】A
【解析】else意為“其他，別的”，如：What else can I say?別的我還能說些什么呢?extra意為“額外的，外加的”，如：an extra loaf of bread多加的一條面包，而這句話要表達的是“也需要其他條件”，而不是“額外條件”，排除C.extra。near和similar意思相差較遠，故選A。
4.【答案】D
【解析】根據下句的解釋，應選“有創造性的”，creative符合題意。generating (生的、生的)、motivating (有動機的)和effective(有效的)意思上不貼切。
5.【答案】B
【解析】sources意為“來源，根源”，如，sources of power意為“能源”。符合題意。origin的意思是“起因，由來”。如：the origin of a river河流的源頭;base是“基礎”的意思;discovery是“發現”的意思。
6.【答案】B
【解析】根據句子的意思，應選create“創造，發明”這個詞。
7.【答案】A
【解析】come from的意思是“出自，來自”，與后面background搭配,意為“出于……背景”。stem from意為“起源于”，如：Her interest in books stems from her childhood.她對書本的興趣是從童年開始的。B、C項的意思不對。
8.【答案】C
【解析】more…than…是固定搭配，意為“與其說……不如……”。本句的`意思是,“與其說是科學家,不如說是發明家”。
9.【答案】C
【解析】pure的意思是“純粹的，單純的”，genuine的意思是“真正的”，practical的意思是“實際的”，clever的意思是“聰明的”,句子的意思是“一個單純的科學家主要致力于精確的科學研究。”
10.【答案】D
【解析】accurately的意思是“精確的”,符合題意。Happily(愉快的);occasionally(時而的，偶然的)和reluctantly(勉強的)均不合題意。
11.【答案】D
【解析】so that是固定搭配，表目的。
12.【答案】C
【解析】這句話的意思是“一個發明家或熱衷于應用科學的人通常試圖創造有使用價值的東西。”
13.【答案】B
【解析】這句話的意思是“通過運用科學理論”，use意為“使用,運用”,故選B。
14.【答案】A
【解析】theories of science的意思是“科學的理論”。
15.【答案】D
【解析】根據句子的意思，“他為了明確的結果而工作”，specific的意思是“明確的”,specialized的意思是“專門的”; sole的意思是“獨有的，單一的”;single的意思是“單獨的,一個人”。
16.【答案】C
【解析】根據題意，one of many other objectives“許多其他東西中的一種”。all,全部; few,幾乎沒有; those,那些;均不合題意。
17.【答案】B
【解析】develop (使)發展。如：to develop a business,發展業務。另一個意思是“研制、開發”，用在這里恰當。如：Many new products have been developed to meet the needs of the people.開發了許多新品以滿足人們的需要。Propose建議。如：I propose resting for half an hour.我提議休息半個小時。Supply提供、供應。如：The government supplies free books to schools.政府為學校免費提供圖書。Offer提供，出價。如：Will you offer the guests some coffee.你能給客人準備些咖啡嗎?
18.【答案】A
【解析】本題要求選用的適與no意義相近的不定代詞，在四個選項中，只有A) little的意思是“幾乎沒有”,后接不可數名詞，符合題意。
19.【答案】B
【解析】本題要求填入的是一個連詞，用來連接一個表示與過去事實相反的虛擬條件句。本句的意思是說：“如果沒有科學家早年打下的基礎，那些在科學上接受過很少或沒有接受過教育的人就不可能有所發明創造”。if的意思是“如果，假使”，通常用在虛擬條件句中。
20.【答案】D
【解析】本題要求填入的副詞用來修飾一個過去完成時的謂語動詞，即表示過去某個時間以前發生的動作，因而只能用D)before。如：He would not have achieved so much in the research if he had not studied chemistry years before.如果他早年沒學過化學的話，他在這項研究中就不可能取得這么大的成績。Ago只與一般過去時連用，表示從現在角度看過去的某一時間。如：He studied chemistry many years ago.他好多年前學過化學。
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