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

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

【答案】C

【解析】句意：他犯了一個錯誤，但是在變得更糟糕之前，他采取了措施改變了這種情況。A. until直到；B. unless 除非；C. before在…… 之前； D. since自從。根據(jù)句意故選C。

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