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
B: not keep
C: not to keep
D: don't to keep
正确答案是:
同类题型
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My dad has lots of writers his friends so he has a collection of books for free.[ ]
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