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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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
______ from his expression, he is in low spirits.
A. Judged
B. Judging
C. Being judged
D. Having judged
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