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

試題分析：考查連詞：A. until直到，B. before在…前面，C. when當….時候，D. as正如，因為，隨著，句意：他犯了錯，但是在還沒有變得更糟前他最終解決了問題。Before還可以翻譯成“在還沒有…的時候”，選B。
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