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