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【题目】He did the cleaning yesterday.(改为否定句)
He the cleaning yesterday.

【答案】didn't;do
【解析】句意:他昨天打扫卫生了。did是do的过去式,为实义动词,变否定句时须借助didn't,后跟动词原形,所以答案是(1). Didn't (2). do。

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