单项选择题

Waves generally result from wind ______ on water.

A．acts
B．to act
C．it acts
D．acting
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单项选择题
John, as well as his brother, ______ wounded in the battle ten years ago.
A．was
B．were
C．is
D．are
单项选择题
So urgent ______ that the doctor rode away without delay.
A．the case was
B．it was the case
C．the case being
D．was the ease
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