◎ 题干
When you are sleeping, you had better _____ all your windows closed.
[     ]
A. not to keep
B. not keep
C. not to keeping
D. not keeping
◎ 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“When you are sleeping, you had better _____ all your windows closed. [ ]A. not to keep B. not keep C. not to keeping D. not keeping …”主要考查了你对  【固定搭配】  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。