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    精英家教网 > 高中英语 > 题目详情
    —I’m sorry,but there’s no smoking on this flight.?
    —Oh,I _______ that.Sorry, I won’t again.
    A．don’t knowB．didn’t know?
    C．won’t knowD．haven’t known?
    B?
    本题考查动词时态。根据句意“在(说话)之前不知道飞机上不能抽烟” 可知，这是对过去事实的叙述，所以用一般过去时。
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