单项选择题

It is high time that something ______.about the traffic problems in Beijing.

A．was done
B．will be done
C．should be done
D．should have been done
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单项选择题
The south of Iceland is always ______ to earthquakes.
A．bound
B．likely
C．liable
D．apt
单项选择题
For him to be re-elected, what is essential is not that his policy works, but that the public believe that it ______.
A．is
B．does
C．has done
D．is done
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