单项选择题

It is up to the government to ______the rights of individual citizens.

A．withdraw
B．withhold
C．upgrade
D．uphold
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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
单项选择题
Silver is the best conductor of electricity, copper ______ it closely.
A．followed
B．following
C．to follow
D．being followed
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