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
That invention of his entitles him ______ a place among the great invent ors.
A．in
B．to
C．on
D．at
单项选择题
He assured us that the house was ______ enough to last another fifty years.
A．substantial
B．steady
C．spacious
D．sophisticated
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