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—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.

A. can; must B. can; may C. must; can D. may; must

 

B

【解析】

试题分析:考查情态动词。can可表示理论上的推测,意为“可能”;may的可能性没有can大;must表肯定推测,意为“一定”。根据答句中的but I’m not sure可知,这里表示不肯定的推测,不能用must,排除ADmust表推测时,不用于否定句和疑问句,排除C。故选B

考点:考查情态动词

 

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