Question

【题目】Because I had a lot of homework to do，I didn't go to bed ____12 o'lock last night.

A. until B. when C,while D.as

Answer 1

【答案】A

【解析】句意：因为我有很多作业要做，昨晚直到12点我才睡觉。A. until到……为止；B. when 当……时候；C. while 正当……时候；D.as由于，当……时候。not…until直到……才。didn’t是did not的缩写，结合句意可知，答案为A。