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：他犯了一個錯誤，但他在它變得更糟前采取了行動改變現狀。Until直到；when當···時；before在···之前；because因為。根據句意可知選C。
考點：考查連詞。