—Must we clean the room at once?
—No，you ________.You can do it after school.
| A．mustn't | B．needn't | C．can't | D．may not |
—Must we clean the room at once?
—No，you ________.You can do it after school.
| A．mustn't | B．needn't | C．can't | D．may not |
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