【題目】He did the cleaning yesterday.（改為否定句）
He the cleaning yesterday.

【答案】didn't；do
【解析】句意：他昨天打掃衛(wèi)生了。did是do的過去式，為實(shí)義動(dòng)詞，變否定句時(shí)須借助didn't，后跟動(dòng)詞原形，所以答案是(1). Didn't (2). do。

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