I __________use a clock to wake me up because at six o'clock each morning the train comes by my house.
A．couldn’tB．mustn’tC．shouldn’tD．needn’t
D
考察情態(tài)動(dòng)詞用法。Needn’t不必。根據(jù)上下文可知每天六點(diǎn)，火車都來到我家旁邊，使用我不必使用鬧鐘。
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