单项选择题

The room was empty, but Tom felt that ______ was watching him.

A．anybody
B．nobody
C．somebody
D．everybody
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单项选择题
Only when you have obtained sufficient data ______ come to a sound conclusion.
A．can you
B．would you
C．you will
D．you can
单项选择题
After having gone ______ far, George did not want to turn back.
A．enough
B．much
C．such
D．that
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