单项选择题

The population of the village has decreased ______ 150 to 500.

A．in
B．at
C．by
D．with
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单项选择题
I wonder why he ______ to discuss the problem at the meeting.
A．declined
B．rejected
C．refused
D．delayed
单项选择题
They overcame all the difficulties and fulfilled the plan three months ahead of time, ______ is something we had not expected.
A．that
B．what
C．it
D．which
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