题目内容

- That must be a mistake.- No, it ________ be a mistake.

A. must not be
B. needn’t
C. cannot be
D. would not be

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It seems like people will do almost anything to stay ______.

A. carefully
B. happily
C. young
D. strongly

You ______ angry with her, for she is too young.

A. need not to be
B. do not need to
C. need not be
D. need not

_____ climb that tall tree?

A. Dare you
B. Doesn’t dare you
C. Will you dare
Dare you to

Hurry up, or you ________ catch the train.

A. can’t
B. needn’t
C. mustn’t
D. shouldn’t