单项选择题

What he has just said has little to do with the question ______ discussion.

A．on
B．under
C．in
D．at
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单项选择题
With the development of production and science, radio ______ a wide application in a short time.
A．found
B．has found
C．finds
D．has founded
单项选择题
Joe had many regrets when he ______ the years he spent abroad.
A．looked back on
B．looked down upon
C．looked up to
D．looked out of
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