【題目】一Excuse me,sir.This is a non-smoking train.

一Oh,sorry.I____ know that.

A.haven’t known B.hadn’t know

C.didn’t know D.don’t know

【答案】C

【解析】

試題分析:考察時(shí)態(tài)。根據(jù)語(yǔ)境來(lái)看,吸煙的人不知道這是一節(jié)無(wú)煙車(chē)廂,這個(gè)不知道的行為發(fā)生在過(guò)去,所以用一般過(guò)去式。該對(duì)話(huà)意思為:--打擾了,先生,這是一節(jié)無(wú)煙車(chē)廂。----哦,對(duì)不起,我不知道。故選C

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