题文
You ________ practise the drums while the baby is sleeping.
| A．needn’t |
| B．mightn’t |
| C．mustn’t |
| D．won’t |
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You ________ practise the drums while the baby is sleeping.
| A．needn’t |
| B．mightn’t |
| C．mustn’t |
| D．won’t |
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