单项选择题

Either of you ______ able to move that stone.

A．are
B．is
C．have been
D．be
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单项选择题
The master is trying to search ______ to the problem of environment.
A．a reaction
B．an answer
C．a reply
D．a solution
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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