问题
选择题
Since I had a lot of homework to do, I didn't go to bed ________ 12 last night.
[ ]
A. until
B. when
C. while
答案
答案：A
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Since I had a lot of homework to do, I didn't go to bed ________ 12 last night.
[ ]
A. until
B. when
C. while
答案：A
