—Last night I watched the football match and didn't go to bed___12 o'clock.

问题描述:

—Last night I watched the football match and didn't go to bed___12 o'clock.
—Last night I watched the football match and didn’t go to bed____12 o’clock.(2002黄冈市)
A. when B. until C. as D. while为什么要选B而不是A呢?求解析,谢谢

not .until 直到……才