He made a mistake but then he corrected the situation it got worse. A. untilB. when C. b

问题补充：

He made a mistake, but then he corrected the situation it got worse.

A. until

B. when

C. before

D. as

答案：

A. until

B. when

(答案→)C. before

D. as

解析：句意：他犯了一个错误，但没等形势恶化就扭转了局面。