—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed12 o

发布时间：2020-08-22 05:03:25

—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
D. unless

网友回答

(答案→)A. until
B. when
C. though
D. unless
解析：本题符合not···until的结构，表示直到···才，故选答案为A
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