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
By the time he arrives in Beijing, we ______ here for two days.
A．will have stayed
B．shall stay
C．have been staying
D．have stayed
单项选择题
______ by the explosion, we all rushed out of the hall.
A．Frighten
B．Frightened
C．Frightening
D．To frighten
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