摘要：31．[2010·全国大联考]- 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 31B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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