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 题目和参考答案——青夏教育精英家教网—

I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house. (2012·新课标全国，30)

A．couldn’t	B．mustn’t
C．shouldn’t	D．needn’t

解析

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