单项选择题

By the following semester, it is likely that the old professor ______ on the campus of California University for two decades.

A. will have to be teaching
B. will have taught
C. will have been teaching
D. will be teaching
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单项选择题
You ______ a mosquito here, because the temperature is far below freezing and any mosquito here has been frozen to death.
A. can’t have seen
B. must not have seen
C. shall not have seen
D. need not have seen
单项选择题
Iceland lies far north in the Atlantic, with its northernmost tip actually ______ the Arctic circle.
A. touched
B. touches
C. touching
D. being touched
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