题目内容

" I know she was in because I heard her radio. but she didn't open the door.""She_______ the bell . "

A. mustn't have heard
B. may not have heard
C. needn't have heard
D. can't have heard

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I can't find Mrs. Fox in her office; she____ for home.

A. might have started
B. might start
C. may be starting
D. may start

If Jackie is as sick as you say . she ______ see a doctor.

A. better
B. had better
C. had rather
D. would rather

"Must I answer all the questions?"" No. you ______ answer them all: it will be sufficient if you do four of them ."

A. mustn't
B. shouldn't
C. don't
D. needn't

Mary got up early, but she ______ so, because she had no work to do that morning.

A. can not have done
B. must not have done
C. shouldn't have done
D. needn't have done