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    精英家教网 > 高中英语 > 题目详情
    Edison asked his father why the hens could hatch eggs ___he couldn’t.
    A．asB．andC．whenD．while
    D
    连词辨析。As因为，随着；and和，并且；when既然，当……时；while然而，当……时候。句意：爱迪生问他的父亲为什么母鸡能孵蛋而他不能。故选D。
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