◎ 题干
—Judy,  you look so tired.
—Yes, I didn't go to bed ____ 12 o'clock last night.   
[     ]
A. when    
B. unless    
C. until    
D. after
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Judy,you look so tired.—Yes, I didn't go to bed ____ 12 o'clock last night. [ ]A. whenB. unlessC. untilD. after…”主要考查了你对  【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。