— Someone is knocking at the door. Is it Ann?

— It _____ be her. She is giving a performance at the theatre now.

A. may B. must C. can’t D. mustn’t

 

C

【解析】

試題分析：句意：有人在敲門。是安嗎？不可能是她�，F(xiàn)在她在劇院演出。May可以；must必須，一定；can’t不能，不會(huì)；mustn’t禁止，不允許。在英語中常用must表示肯定的推測(cè)，常用can’t表示否定的推測(cè)。所以選C。

考點(diǎn)：考查情態(tài)動(dòng)詞。

 

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