◎ 题干
Let's go to bed. It's _____nine thirty.
[     ]
A. at
B. in
C. on
D. about
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Let's go to bed. It's _____nine thirty. [ ]A. at B. in C. on D. about …”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。