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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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