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【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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