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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The problem of ______to select as his successor was quickly disposed of.
A．what
B．whom
C．which
D．how
单项选择题
We have ______medical service.
A．priceless
B．free charge
C．no charge
D．free
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