Question

【题目】He made a mistake, but then he took action to change the situation ________ it got worse.
A.until
B.when
C.before
D.because

Answer 1

【答案】C
【解析】句意：他犯了一个错误，但他在它变得更糟前采取了行动改变现状。Until直到；when当···时；before在···之前；because因为。根据句意可知选C。