- It be Mr．Johnson who is in the office． - No, it be him．I saw him off at the airport half an hour ago． A．can’t ; can’t B．must; can’t C．must; mustn’t D．may; mustn’t 题目和参考答案——青夏教育精英家教网—

题目内容

— It _______ be Mr．Johnson who is in the office．

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

A．can’t ; can’t　 B．must; can’t　 C．must; mustn’t D．may; mustn’t

考查must表推测的用法。must只能用于肯定句；在否定句和疑问句中用can。

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