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    精英家教网 > 高中英语 > 题目详情

    —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A、D；must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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