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
A darkened sky in the daytime is usually an indication that a storm is （）.

A．possibly coming
B．about to take place
C．close by
D．expected to be severe
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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