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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