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—Must we clean the classroom at once?
—No, you         . You can clean it after school.
A. needn’t                 B. mustn’t         C. must
A

试题分析:句意:—我必须立刻打扫教室吗?—不,你不必。你可以放学后打扫。根据题干分析,以must开头的一般疑问句,否定回答要用needn’t,意思是“不必”,故选A。
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