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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

解析试题分析:句意:他犯了一个错误,但是他接着采取了措施在情况恶化之前改变了这种状况。before意为“在……之前”,即在形势恶化之前采取措施;故选C。
考点:考查连词的用法。

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