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，但他在它變得更糟前采取了行動(dòng)改變現(xiàn)狀。Until直到；when當(dāng)···時(shí)；before在···之前；because因?yàn)�。根�?jù)句意可知選C。
考點(diǎn)：考查連詞。