问题
选择题
I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.[ ]
A. couldn't
B. mustn't
C. shouldn't
D. needn't
答案
答案：D
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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. couldn't
B. mustn't
C. shouldn't
D. needn't
答案：D