Question

【题目】He made a serious mistake, but he took action to change that _________ it got worse.

A. until B. when C. because D. before

Answer 1

【答案】D

【解析】

试题分析：句意：他犯一个严重的错误。但他采取行动来改变它以免变得更糟。A. Until直到；B. When当……时；C. Because因为；D. Before在……之前。在变得更糟之前采取行动改变。故选D。