Question

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

C

解析試題分析：句意：他犯了一個(gè)錯(cuò)誤，但是他接著采取了措施在情況惡化之前改變了這種狀況。before意為“在……之前”，即在形勢(shì)惡化之前采取措施；故選C。
考點(diǎn)：考查連詞的用法。