---________ we clean the classroom at on...

---________ we clean the classroom at once?

---No, you________. You ________clean it after school

A．Must, needn’t, can	B．Need, mustn’t ,may
C．Must, mustn’t, can	D．Shall, can’t , may

A 【解析】Must 为特殊疑问词引导一般疑问句时，其否定回答为needn’t，故选A

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