21.--Listen! Is professor giving a speech in class?--No.it be him.He has gone to France.A.may not B.mustn't C.needn't D.can't 查看更多

 

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-Listen! Is Professor Bloom giving a speech in class?

-No,it ________ be him.He has gone to France.

[  ]

A.may not

B.mustn't

C.needn't

D.can't

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