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    He made a mistake, but finally he solved the problem __________ it got worse.

    A．until B．before C．when D．as

    B

    解析试题分析：考查连词：A. until直到，B. before在…前面，C. when当….时候，D. as正如，因为，随着，句意：他犯了错，但是在还没有变得更糟前他最终解决了问题。Before还可以翻译成“在还没有…的时候”，选B。
    考点：考查连词

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