—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】

試題分析:考查情態(tài)動詞。can可表示理論上的推測,意為“可能”;may的可能性沒有can大;must表肯定推測,意為“一定”。根據(jù)答句中的but I’m not sure可知,這里表示不肯定的推測,不能用must,排除A、D;must表推測時(shí),不用于否定句和疑問句,排除C。故選B。

考點(diǎn):考查情態(tài)動詞

 

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