单项选择题

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

A．is ever built
B．has ever been built
C．was ever built
D．has ever built
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单项选择题
______ by the explosion, we all rushed out of the hall.
A．Frighten
B．Frightened
C．Frightening
D．To frighten
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
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