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【题目】She ___________ clean the classroom today.

A. isn’t have to B. don’t have to

C. doesn’t have to D. have to

【答案】C

【解析】

试题分析:句意:今天她不必打扫教室。短语have to+动词的原形,表示必须做某事;主语是第三人称单数。其否定形式要用助动词does+not,根据句意,故选C

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