单项选择题

Three-fourths of the surface of the earth _______sea.

A．are
B．were
C．is
D．has been
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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．with
B．from
C．for
D．to
单项选择题
_______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
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