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    【题目】— Excuse me, sir. I'm afraid you can't smoke here. This is non-smoking area.
    —Oh, sorry. I ____________ the sign.
    A.don't see
    B.didn't see
    C.didn't saw
    D.saw

    【答案】B
    【解析】句意：--打扰一下，先生。恐怕你不能在这儿吸烟。这里是无烟区。--哦，真抱歉，我没看见指示牌。结合语境，推知对话发生在现在，而没看见标识牌是发生在过去，应该使用一般过去时态。根据句意及结构，故选B。

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