单项选择题

A. 1998-2000.
B. 1989-1992.
C. 1998-2001.
D. 1999-2002.
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单项选择题
A. Great, congratulations B. It is very difficult. C. She is very clever. D. The university is very famous.
A. Great, congratulations B. It is very difficult.
C. She is very clever. D. The university is very famous.
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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