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
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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
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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