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
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
单项选择题
It ______ our teacher came that we began the examination.
A. was until
B. is until
C. was not until
D. is not until
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