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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单项选择题
I cannot sleep. The dog next door is making too much noise. I wish it ______ quiet.
A．kept
B．would keep
C．had kept
D．to keep
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
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