1. Look! The light is out in her room. She ———— to bed already. A. must go B. had to go C.must have gone D.has gone 2. ─There were already five people in the car but they managed to take me as well.─ It______ a comfortable journey.A. can't be B. shouldn't be C. mustn't have been D. couldn't have been3. My sister met him at the Grand Theatre yesterday afternoon, so he ___ your lecture.A. couldn't have attended B. needn't have attendedC. mustn't have attended D. shouldn't have attended4. You ______ be tired - you've only been working for an hour.A. must not B. won' t C. can' t D. may not5. - Isn' t that Ann's husband over there?- No, it _______ be him -I'm sure he doesn't wear glasses.A. can't B. must not C. won't D. may not6. I was on the highway when this car went past followed by a police car. They ______ at lease 150 km an hour.A. should have been doing B. must have been doingC. could have done D. would have done7. He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.A. should B. must C. wouldn’t D. can’t8. This cake is very sweet. You __________ a lot of sugar in it.A．should put B．could have put C．might put D．must have put9.—Tom is never late for work. Why is he absent today?—Something ________ to him.A．must happen B．should have happened C．could have happened D．must have happened情态动词 must, can, could, may, might 表推测的用法 情态动词中的 must, can, could, may, might 都表推测。其中 must 的可能性最大，can / could 次之，may / might 最小。具体用法如下： 1.must 的用法（1）表示推测“可能性”时，意思是“一定、准是”，语气较肯定，较有把握He must be American. = It is certain that he is American. 他准是个美国人。（2）must 表推测只能...
