单项选择题

It's important for us to ______ our forest resources.

A．conserve
B．reserve
C．prevent
D．store
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单项选择题
He made ______ that he had to resign.
A．so a big mistake
B．a so big mistake
C．such a big mistake
D．such big a mistake
单项选择题
The peasants shifted to the crops ______ less water.
A．needing
B．needed
C．needs
D．need to
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