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【题目】Each class lasts 50 minutes in our school. (改为否定句)
Each class 50 minutes in our school.

【答案】doesn't;last
【解析】句意:在我们学校每节课持续50分钟。主语是each class, 谓语动词要用单数,lasts是行为动词,变成否定句要用助动词doesn't+动词原形,故答案为doesn't last。

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