Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't

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• Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't
• Must I clean the classroom now?No,you____.You can do it after school. A.mustn't B.can't C.don't选什么,写出理由!急啊!
• Must we clean the classroom now?No,you needn't.It ______ after school.A.may clean B.must clean C.need be cleaned D.can be cleaned[正确答案是D,为什么不选C]
• Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't为什么选d
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