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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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
单项选择题
By the time I left the school, the professor ______ that class for two years.
A. has taught
B. had taught
C. will have taught
D. will teach
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