【題目】–Must we clean the classroom at once?–No, you _______. You _______ clean it after school.
A.mustn't; may
B.may not; must
C.don't have to; may
D.can't; must

【答案】C
【解析】句意：---我們必須馬上打掃教室嗎？---不，你不必，你可以放學(xué)后打掃。回答must的問句，肯定用must，必須；否定用needn't或者don't have to，不必。may可以。根據(jù)句意，所以答案是C。

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