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【题目】—Look at the sign. You can’t swim here.

—Sorry. I ________ (not see) it.

【答案】didn’t see

【解析】

句意:——看那个标志,你在这儿不能游泳。——对不起,我没有看到。

根据上文“Look at the sign. You can’t swim here.”可知下文没有看到的动作发生在过去,用一般过去时,此处是否定形式,要借助动词did+not+动词原形。故答案为didn’t see

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