单项选择题

He kept his head at that critical moment; otherwise the accident ______.

A．would happen
B．happened
C．would have been happened
D．would have happened
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单项选择题
______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth
单项选择题
ff you don't agree with me, feel free to ______ your own proposals.
A．put forward
B．put out
C．put on
D．put in
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