◎ 题干
— When did it happen?    
— At 5:55 a.m. _____ the morning of December 15.
[     ]
A. on
B. in
C. at
D. by
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“— When did it happen?— At 5:55 a.m._____ the morning of December 15. [ ]A. on B. in C. at D. by…”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。