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．with
B．from
C．for
D．to
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_______he is still working on the project, I don''t mind when he will finish it.
A． In case
B． As long as
C． Even if
D． As far as
单项选择题
The cost of traveling around the eight European countries can run as high_______$2,000.
A． to
B． as
C． by
D． for
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