He made a mistake, but then he took action to change the situation ________ it got worse.

A．until B．when C．before D．because

C

解析試題分析：句意：他犯了一個錯誤，但是他接著采取了措施在情況惡化之前改變了這種狀況。before意為“在……之前”，即在形勢惡化之前采取措施；故選C。
考點：考查連詞的用法。

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