◎ 题干
It's time for class. Don't knock ____ outside the classroom.
[      ]
A. about
B. down
C. into
D. in
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It's time for class. Don't knock ____ outside the classroom.[ ]A. aboutB. down C. into D. in …”主要考查了你对  【介词和介词短语】  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。