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1. “I thought you wouldn’t mind.” “Well, as a matter of fact I don’t, but you _____ me first.”
A. should ask B. should have asked
C. must ask D. must have asked
2. “I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
A. must be B. must have been
C. might be D. can have been
3. That car nearly hit me; I ______.
A. might be killed B. might have been killed
C. may be killed D. may been killed
4. It’s a very kind offer, but I really _____ accept it.
A. mustn’t B. needn’t
C. can’t D. don’t
5. The police still haven’t found her, but they’re doing all they _____.
A. may B. can
C. must D. will
6. You _____ practise the drums while the baby is sleeping.
A. needn’t B. mightn’t
C. mustn’t D. won’t
7. You _____ him the news; he knew it already.
A. needn’t tell B. needn’t have told
C. mightn’t tell D. mightn’t have told
8. As she’s not here, I suppose she _____ home.
A. must go B. must have gone
C. might go D. might be going
9. Are you still here? You ______ home hours ago.
A. should go B. should have gone
C. might go D. may have gone
10. “I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
A. must be B. must have been
C. might be D. can have been
11. I _______ have met him a long time ago. Both his name and face are very familiar.
A. may B. can
C. would D. should
13. “Shall we go shopping?” “Sorry, we _______ buy anything now because none of the shops are open.”
A. mustn’t B. needn’t
C. can’t D. shouldn’t
14. They often go to the restaurants for meals. They _____ be very poor.
A. mustn’t B. can’t
C. may not D. needn’t
15. I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.
A. mustn’t B. shouldn’t
C. needn’t D. couldn’t
17. He ______ the test again, in which case, his mother will be very disappointed.
A. might fail B. must have failed
C. should fail D. could have failed
18. “Why didn’t she come to the meeting yesterday?” “I’m not so sure. She ______ ill.”
A. should be B. should have been
C. must be D. might have been
19. Why did you just sit and watch? You _______ me.
A. could help B. should help
C. could have helped D. must have helped
20. “You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”
A. can ask, will waste
B. must have asked, had wasted
C. could have asked, was wasted
D. shouldn’t have asked, would be wasted
21. “Is there a flight to
A. must B. might
C. would D. can
22. “Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
A. might fall out B. could fall out
C. should have fallen out D. must have fallen out
23. “Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
A. must; could B. may; might
C. need; must D. could; need
25. “Did Jim come?” “I don’t know. He _______ while I was out.”
A. might have come B. might come
C. mush have come D. should have come
【答案與解析】
1. 選B，should 后接動詞完成式表示“本來應該做某事，結果未做”，此處含有責備之意。
2. 選B，對過去情況的肯定推測，宜用“情態動詞 + 動詞完成式”，再根據句意，可確定答案為B。注：can 表示推測通常不用于肯定陳述句。
3. 選B，表示過去可能發生而實際上未發生的事，用might + 動詞完成式。若只是推測過去可能已經發生的事，則可用 may [might] + 動詞完成式，如 He may [might] have gone. 他可能已經走了。
4. 選C。由句意可知。
5. 選B，do all one can 意為“盡力”或“竭盡全力”。
6. 選C，mustn’t 在此相當于 can’t，且語氣更強。
7. 選B，“needn’t + 動詞完成式”的意思是：本來不必做某事，但實際上做了。上句意思是“你本來不必告訴他這個消息的，因為他(當時)已經知道了”。注意，句中 knew 為過去式。
8. 選B，must 后接動詞完成式表示對過去情況的肯定推測，意為“一定已經做了某事”。
9. 選B，should 后接動詞完成式表示“本來應該做某事，結果未做”。
10. 選B，對過去情況的肯定推測，宜用“情態動詞 + 動詞完成式”，再根據句意，可確定答案為B。注：can 表示推測通常不用于肯定句。
12. 選A。may have done sth 表示對過去可能發生的事進行推測，意為“可能曾經”。
13. 選C。根據上下文的語境推知。can’t 意為“不能”。
14. 選B。根據上下文的語境推知。can’t 表推測，意為“不不能”。
16. 選D。couldn’t have done sth 表示對過去情況進行推測，意為“過去不可能發生過某情況”。
17. 選A。根據下文的 will be 可知，“他考試再不及格”是將來的事，據此可排除B和D。再根據語意，排除C。
18. 選D。從時間上看，由于是昨天沒來開會，所以推測他生病也應指昨天，故排除A和C。從語境上看，既然上文說 I’m not so sure，那么說明說話者對自己的推測沒有很大把握，故選D。
19. 選C。根據上文的過去時態可知，此句談的是過去的事，故排除A和C。根據語境排除D。
20. 選C。couldn’t have done sth 結構在此表示責備，指過去本來可以做某事但實際上未做。第二空填 was wasted，陳述的是過去的一事實。(www.hz123456.com)
21. 選B。根據下文的 I’ll phone the airport and find it out 可知，說話人對自己的推測沒有很大把握，故選 might。若選A，語氣太強，不合語境；若選D，不合語法習慣，因為can 表推測通常不用于肯定陳述句中。
22. 選D。既然“通行證現在不在口袋里”，那么它“掉出去”應發生在過去，故排除A和B。比較選項C和D所表示的意思，選D更恰當。
24. 選A。根據 Don’t be so sure 可知前面一空應填must。第二空填的could表示推測，雖為過去式形式，但表示現在意義，語氣較委婉，它與表推測的 can 主要用于否定句和疑問句不同，它可以用于肯定陳述句。
25. 選A。根據句中有關時態可知“他來”發生在過去，故排除B；根據 I don’t know 可知選項C語氣太肯定，不合適；選項D的意思是“本來應該來”，與語境不合。
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