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
I can't ______ what has happened to the vegetables, for they were freshly picked this morning.
A. figure out
B. work out
C. look out
D. turn out
单项选择题
What he has just said has little to do with the question ______ discussion.
A. on
B. under
C. in
D. at
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