单项选择题

This is one of the highest buildings that ______ in our city.

A．are ever built
B．have ever built
C．have ever been built
D．were ever built
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单项选择题
By the time you came back yesterday, they ______ for London.
A．have left
B．left
C．had left
D．leave
单项选择题
I hope they ______ the bridge by the time we leave at the end of this month.
A．have built
B．will have built
C．will build
D．are to build
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