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He made a mistake, but he took action to...

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

A. until    B. unless    C. before    D. since

 

C 【解析】句意:他犯了一个错误,但是在变得更糟糕之前,他采取了措施改变了这种情况。A. until直到;B. unless 除非;C. before在…… 之前; D. since自从。根据句意故选C。  
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