--- May I go swimming now?
--- No, you ______. You must finish your homework first.
| A．mustn’t | B．may not |
| C．couldn’t | D．needn’t |
--- May I go swimming now?
--- No, you ______. You must finish your homework first.
| A．mustn’t | B．may not |
| C．couldn’t | D．needn’t |
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