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 --辦公室里一定是John.
--不,不可能是他.半個小時之前我在機場目送他離開的.

解答 答案:B
解析:根據(jù)答句后面的"半個小時之前我在機場目送他離開的"可知回答者的意思是"不可能"是John,故C、D選項直接排除(mustn't意為"禁止");由此反推上一句的句意為"辦公室里一定是John",故A選項(can't不可能)排除(如果選擇A則上下句子互相矛盾).綜上,本題答案為B選項.

點評 本題考查情態(tài)動詞的辨析,做此類題題目時一定要清楚各個選項的含義及用法,再結(jié)合選項分析及其它要求選出最終答案.

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