题文
I ______ use a clock to wake me up because at six o’clock each morning the first train passes by my house.
| A．couldn’t | B．mustn’t |
| C．shouldn’t | D．needn’t |
I ______ use a clock to wake me up because at six o’clock each morning the first train passes by my house.
| A．couldn’t | B．mustn’t |
| C．shouldn’t | D．needn’t |
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