— 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’t                                          B. must; can’t  

C. must; mustn’t                                              D. may; mustn’t

B


解析:

must表推測只用于肯定句;在否定句和疑問句中用can。

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科目:高中英語 來源:皇冠優(yōu)化名題 高中英語 題型:050

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科目:高中英語 來源: 題型:閱讀理解

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