单项选择题

He______his first book to his mother.

A．committed
B．dedicated
C．assigned
D．appointed
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单项选择题
I was on the______of accepting.
A．border
B．tip
C．verge
D．side
单项选择题
A______component of any democracy is a free labor movement.
A．vital
B．visual
C．sole
D．single
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