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
With the development of production and science, radio ______ a wide application in a short time.
A. found
B. has found
C. finds
D. has founded
单项选择题
He must have come here yesterday evening, ______ he
A. did
B. has
C. haven't
D. didn't
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