题目内容

---________ we clean the classroom at once?
---No, you________. You ________clean it after school
A．Must, needn’t, canB．Need, mustn’t ,may
C．Must, mustn’t, canD．Shall, can’t , may
A
考查情态动词。Must引导一般疑问句，肯定回答用must，其否定回答为needn’t，can在这里表示许可的意思，may表示可能性，句意：我必须马上清扫教室吗？不，你比比清扫，你可以放学之后清扫。故选A
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