单项选择题

He hopes he can visit the United Nations building while he ______ in New York next summer.

A．has been
B．is
C．will be
D．shall be
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单项选择题
He ran back into the room to see if he ______ anything behind.
A．has forgotten
B．had forgotten
C．has left
D．had left
单项选择题
I thought that the three months there ______ us a lot of good.
A．has done
B．have done
C．do
D．had done
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