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    精英家教网 > 高中英语 > 题目详情

    【题目】—It ________ be John who is in the office.

    —No, it ________ be him. I saw him off at the airport half an hour ago.

    A. can’t; can’tB. must; can’t

    C. must; mustn’tD. may; mustn’t

    【答案】B

    【解析】

    考查情态动词表示推测。句意：——一定是约翰在办公室。——不，不可能是他。半小时前我到机场送他。must表推测只用于肯定句；在否定句can’t“不可能”，表示有把握的否定推测。故选B。

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