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
My younger brother is the only one of the students who ______ chosen to join the air force.
A．is
B．are
C．were
D．was
单项选择题
She sings very beautifully as if she ______ a trained singer.
A．is
B．was
C．were
D．will be
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