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

—Sorry. I ________ (not see) it.

【答案】didn’t see

【解析】

句意:——看那個標志,你在這兒不能游泳。——對不起,我沒有看到。

根據(jù)上文“Look at the sign. You can’t swim here.”可知下文沒有看到的動作發(fā)生在過去,用一般過去時,此處是否定形式,要借助動詞did+not+動詞原形。故答案為didn’t see

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