【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:考察時態(tài)。根據(jù)語境來看,吸煙的人不知道這是一節(jié)無煙車廂,這個不知道的行為發(fā)生在過去,所以用一般過去式。該對話意思為:--打擾了,先生,這是一節(jié)無煙車廂。----哦,對不起,我不知道。故選C

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