--______ we clean the classroom at once?
--No, you _____. You____ clean it after school.
| A．Must, needn’t, may | B．Must, mustn’t, can |
| C．Shall, can’t, must | D．Need, mustn’t, may |
--______ we clean the classroom at once?
--No, you _____. You____ clean it after school.
| A．Must, needn’t, may | B．Must, mustn’t, can |
| C．Shall, can’t, must | D．Need, mustn’t, may |
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