单项选择题

You may conclude from this article that it is ______ using machines to make a person breathe for years if his brain is dead.

A．a clever way
B．a wise way
C．no use
D．quite useful
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单项选择题
A．theirB．itsC．it'sD．whose
A．their
B．its
C．it's
D．whose
单项选择题
A．usedB．usingC．usesD．to use
A．used
B．using
C．uses
D．to use
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