题目内容

【题目】Jim did his homework on the computer．(改为否定句)
Jim his homework on the computer．

【答案】didn't；do
【解析】原句是一般过去时，否定句需要加助动词 did，后面跟动词原形，故填 didn't do。句意是：吉姆没有在电脑上做家庭作业。

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