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

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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

单项选择题

This is an ideal site for a university ______ it is far from the downtown area.

A. provided that
B. now that
C. so that
D. in that

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