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. 查看更多

 

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