Question

【题目】—Tom, you look tired this morning. What's wrong?

—I was so busy that I didn't go to bed _____ 12 o'clock last night.

A. until B. when C. though

Answer 1

【答案】A

【解析】

句意：——汤姆，你今天早上看起来很累，你怎么了？——昨天晚上我是如此忙以至于12点才去睡觉。A. until直到……；B. when何时；C. though尽管。Not…until…表示直到……才……。根据题意，故选A。