单项选择题

You should visit the Empire State building ______ you are in New York.

A．where
B．while
C．which
D．that
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单项选择题
He has never seen the Greens and he knows ______ about them.
A．little
B．a little
C．something
D．anything
单项选择题
It is necessary that anyone ______ exercises every day if he wishes to keep healthy.
A．would do
B．will do
C．did
D．do
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