单项选择题

Do what you think is right,______ they say.

A．however
B．no matter how
C．whichever
D．whatever
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单项选择题
We often advise him not to drink more wine______ is good for his health.
A．as
B．than
C．that
D．but
单项选择题
The old farmer was run down by a car. He was taken to the hospital and______ on by the chief surgeon right now.
A．operated
B．having been operated
C．is operated
D．is being operated
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