单项选择题

I ran ______ one of my former classmates, who was on her way to see me.

A．up
B．out of
C．over
D．into
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单项选择题
It is useful to be able to predict the extent ______ which a price change will affect supply and demand.
A．from
B．with
C．to
D．for
单项选择题
The concert hall has a seating ______ of 1,000.
A．capacity
B．volume
C．vessel
D．amount
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