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    精英家教网 > 高中英语 > 题目详情
    I had been puzzled over the problem for over an hour without any result,      all at once a solution flashed across my mind.
    A．whileB．when
    C．thenD．as
    B
    考查连词的用法。while当什么的时候，when正在那时，then那时，as意为，当什么的时候，句意：对这个问题我已经困惑了一个多小时了没有任何的结果，突然正在那时一个解决方案在我脑海闪现。故选B。
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