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    精英家教网 > 高中英语 > 题目详情
    --Excuse me, I don't think you can smoke here.
    ---Really sorry. I ______ this is a non-smoking room.
    A．didn't knowB．don't knowC．have no ideaD．haven't known
    A

    试题分析：考查时态：句子的意思是：——打扰一下，先生，这是禁烟室。——抱歉，我不知道这是禁烟室。“我不知道这是禁烟室”应该是发生在过去的事情，所以使用一般过去时即可。选A。
    点评：对于时态的考查要放个在具体的语境中，不能孤立，。
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