问题
选择题
We must know what we should do and what we should avoid ______a good impression on others in public place.
A．to leave
B．leaving
C．to have left
D．leave
答案
答案：A
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We must know what we should do and what we should avoid ______a good impression on others in public place.
A．to leave
B．leaving
C．to have left
D．leave
答案：A