单项选择题

This is one of the longest bridges that ______ on this river.

A．is ever built
B．was ever built
C．has ever been built
D．has ever built
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单项选择题
Little ______ that the police are about to arrest him.
A．he knows
B．he doesn't know
C．does he know
D．doesn't he know
单项选择题
The government has ______ a committee to investigate this matter in local elections.
A．set ont
B．set to
C．set up
D．set about
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