单项选择题

I was on the______of accepting.

A．border
B．tip
C．verge
D．side
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单项选择题
A______component of any democracy is a free labor movement.
A．vital
B．visual
C．sole
D．single
单项选择题
It is important for university to keep______with the changes in science and technology.
A．step
B．stage
C．pace
D．space
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