He made a mistake but then he corrected the situationit got worse.A. untilB. whenC. befor

问题补充：

He made a mistake，but then he corrected the situationit got worse.

A. until

B. when

C. before

D. as

答案：

A. until

B. when

(答案→)C. before

D. as

解析：“他犯了一个错误，但没等形势恶化，他就扭转了局面。”本题考查连词before的用法。该句中的before意为“还未……就……”。