— _______ 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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