When you are sleeping, you had better __
问题:
When you are sleeping, you had better _____ all your windows closed. [ ]
A. don't keep
B. not keep
C. not to keep
D. don't to keep
When you are sleeping, you had better _____ all your windows closed. [ ]
A. don't keep
B. not keep
C. not to keep
D. don't to keep