【題目】Jim did his homework on the computer.(改為否定句)
Jim his homework on the computer.

【答案】didn't;do
【解析】原句是一般過去時,否定句需要加助動詞 did,后面跟動詞原形,故填 didn't do。句意是:吉姆沒有在電腦上做家庭作業(yè)。

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