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【题目】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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