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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单项选择题
For those who have hearing problems telephones with volume controls provide the best ______.
A．result
B．reply
C．response
D．solution
单项选择题
It is only when you nearly lose someone ______ fully conscious of how much you value him.
A．do you become
B．then you become
C．that you become
D．have you become
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