1. He _____ unwisely, but he was at least trying to do something helpful. (1999)

A. may have acted B. must have acted C. should act D. would act

A，may have done表示过去可能做过某事，B表示一定做过，推测的可能性很大。

2. How can I ever concentrate if you _____ continually ____ me with silly questions? (97)

A. have … interrupted B. had … interrupted

C. are … interrupting D. were … interrupting

C，现在进行时与always, continually, constantly连用表示某种带有感情色彩，经常发生的动作。本句暗含责备之义。

3. Come and see me whenever ______. (97)

A. you are convenient B. you will be convenient

C. it is convenient to you D. it will be convenient to you

C，whenvever引导的时间状语从句用一般现在时表将来;convenient一词只能说it is convenient to sb.

4. For some time now, world leaders __ out the necessity for agreement on arms reduction. (02)

A. had been pointing B. have been pointing C. were pointing D. pointed

B，现在完成进行时表示动作从过去某一时间开始延续到现在，并可能继续。

5. Jack _____from home for two days now, and I am beginning to worry about his safety. (03)

A. has been missing B. has been missed C. had been missing D. was missed

A，同上。“杰克离家两天(到现在还没回)，我开始担心他的安全。”

6. _________ conscious of my moral obligations as a citizen. (05)

A. I was and always will be B. I have to be and always will be

C. I had been and always will be D. I have been and always will be

D， ABC三项前后两个时态不一致，只有D项中现在完成时与将来时搭配一致。

7. So badly _____ in the car accident that he had to stay in hospital for a few months. (94)

A. did he injure B. injured him C. was he injured D. he was injured

C，倒装，将助动词提到主语前，被动。

8. He is not under arrest, ______ any restriction on him. (95)

A. or the police have placed B. or have the police placed

C. nor the police have placed D. nor have the police placed

D，AB中的or表示“否则”，与题意不符;nor放在句首要倒装。

9. ___ both sides accept the agreement ___ a lasting peace be established in this region. (04)

A. Only if, will B. If only, would C. Should, will D. Unless, would

A，only if表示“只有。。。才”，放在句首，句子要倒装;“只有双方都接受和约，永久的和平才有可能建立起来”。if only表示“要是。。。多好”

10. A hibernating animal needs hardly any food all through the winter, _____? (92)

A. need it B. needn’t it C. does it D. doesn’t it

C，need是实义动词不是情态动词，hardly是否定副词，因此前面的分句是否定句。

11. You and I could hardly understand, ______? (95)

A. could I B. couldn’t you C. couldn’t we D. could we

D，hardly的解释同上。

12. When you have finished with that video tape, don’t forget to put it in my drawer, ___? (97)

A. do you B. will you C. don’t you D. won’t you

B，前面句子是第二人称祈使句时，后面要用will (would) you或won’t you; 本题中，前面的句子是否定句，因此后面用肯定的。

13. Do help yourself to some fruit, _____ you? (00)

A. can’t B. don’t C. wouldn’t D. won’t

D，同上。

14. She would have been more agreeable if she had changed a little bit, _____? (03)

A. hadn’t she B. hasn’t she C. wouldn’t she D. didn’t she

C，反意疑问句的谓语动词与主句一致。“她如果稍微改变一下就会更受欢迎，对吗?”