单项选择题

A. Great, congratulations B. It is very difficult.
C. She is very clever. D. The university is very famous.
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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
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
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