问题
选择题
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
答案
答案：B
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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：B