【题目】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
在线课程【答案】C
【解析】
试题分析：考察时态。根据语境来看，吸烟的人不知道这是一节无烟车厢，这个不知道的行为发生在过去，所以用一般过去式。该对话意思为：--打扰了，先生，这是一节无烟车厢。----哦，对不起，我不知道。故选C
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