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