单项选择题

Be sure ______ the window open when you leave the room.

A. to not keep
B. not keeping
C. not to keep
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单项选择题
Please tell me all ______ you know.
A. what
B. which
C. that
单项选择题
— When do you want to start — ______ , I will wait until the heavy rain stops.
A. To be safe
B. Safely
C. Be safe
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