题目内容

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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