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
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单项选择题
He must have come here yesterday evening, ______ he
A．did
B．has
C．haven't
D．didn't
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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