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
Very few scientists ______ completely new answers to the world's problems.
A．come up with
B．come out
C．come round
D．come up to
单项选择题
This article was written ______ for China Daily.
A．extensively
B．exceedingly
C．excessively
D．exclusively
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