They didnt go to bed the work was finished.A. whenB. whileC. until D. after

问题补充：

They didn go to bed the work was finished.

A. when

B. while

C. until

D. after

答案：

A. when

B. while

(答案→)C. until

D. after

解析：考查固定用法“直到---才---” not--- until---