【題目】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】

試題分析:句意:今天她不必打掃教室。短語(yǔ)have to+動(dòng)詞的原形,表示必須做某事;主語(yǔ)是第三人稱(chēng)單數(shù)。其否定形式要用助動(dòng)詞does+not,根據(jù)句意,故選C。

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