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

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

考點(diǎn)：考察時(shí)態(tài)。

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