【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】句意:今天她不必打掃教室。短語have to+動詞的原形,表示必須做某事;主語是第三人稱單數(shù)。其否定形式要用助動詞does+not,根據(jù)句意,故選C。

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