单项选择题

______ is known to us all, the earth moves around the sun.

A．Because
B．For
C．So
D．As
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单项选择题
But for my classmates' help, I ______ the work in time.
A．did not finish
B．could not finish
C．will not finish
D．would not have finished
单项选择题
We have a desperate need ______ practice strict economy in every department.
A．to
B．of
C．for
D．about
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