题目内容

He made a mistake, but finally he solved the problem __________ it got worse.
A．untilB．beforeC．whenD．as
B

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。
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