【題目】—It ________ be John 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

【答案】B

【解析】

考查情態(tài)動(dòng)詞表示推測(cè)。句意：——一定是約翰在辦公室。——不，不可能是他。半小時(shí)前我到機(jī)場(chǎng)送他。must表推測(cè)只用于肯定句；在否定句can’t“不可能”，表示有把握的否定推測(cè)。故選B。

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