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    精英家教网 > 高中英语 > 题目详情
    — It _______ be Jack 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
    B
    must表推测只用于肯定句；在否定句和疑问句中用can。
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