单项选择题

After three hours' mountain climbing, their legs ______ under them.

A．gave up
B．gave in
C．gave out
D．gave away
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单项选择题
Our bank remains ______ 24 hours a day around a week.
A．open
B．opened
C．openly
D．opening
单项选择题
They have decided to build ______ across the river to solve the traffic problem.
A．a bridge five hundred meters long
B．a bridge of five hundred meter long
C．a bridge five hundred-meter-long
D．a five hundred meters long bridge
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