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
The three men tried many times to sneak across the border into the neighboring country, ______by the police each time.
A．had been captured
B．being always captured
C．only to be captured
D．unfortunately captured
单项选择题
The statistics ______that living standards in the area have improved drastically in recent times.
A．proves
B．is proving
C．are proving
D．prove
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