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5.-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'tC.must; mustn'tD.may; mustn't

分析 --办公室里一定是John.
--不,不可能是他.半个小时之前我在机场目送他离开的.

解答 答案:B
解析:根据答句后面的"半个小时之前我在机场目送他离开的"可知回答者的意思是"不可能"是John,故C、D选项直接排除(mustn't意为"禁止");由此反推上一句的句意为"办公室里一定是John",故A选项(can't不可能)排除(如果选择A则上下句子互相矛盾).综上,本题答案为B选项.

点评 本题考查情态动词的辨析,做此类题题目时一定要清楚各个选项的含义及用法,再结合选项分析及其它要求选出最终答案.

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