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    精英家教网 > 高中英语 > 题目详情
    Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.
    A．whenever B．by the timeC．the moment D．ever since
    Ｂ
    考察时态。By the time到…时为止；根据he had learned advance mathematics by himself中的过去完成时，可知所选择的连词是与完成时连用的，结合句意可知Ｂ正确。句意：爱迪生是一个聪明的孩子。到他１４岁的时候，他已经自学了高等数学。
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