单项选择题

I wonder why he ______ to discuss the problem at the meeting.

A．declined
B．rejected
C．refused
D．delayed
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单项选择题
You can hang up what you like on these ______ walls.
A．bare
B．empty
C．blank
D．vacant
单项选择题
She can't prevent her little boy ______ shooting ______ birds.
A．from; to
B．on; at
C．with; up
D．from; at
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