单项选择题

Professor Wang, ______ for his informative lectures, was warmly received by his students.

A．knowing
B．to be known
C．known
D．having known
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单项选择题
The reason why I can't attend the ball is ______ I'm to see off one of my friends at the railway station.
A．for
B．why
C．because
D．that
单项选择题
Between 1974 and 1997, the number of overseas visitors expanded ______ 27%.
A．by
B．to
C．for
D．in
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