单项选择题

Between 1975 and 1996, the number of overseas visitors expanded ______ 27% on average each year.

A．in
B．by
C．for
D．to
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单项选择题
It will take you one hour and fifty minutes ______ the top of Mount Tai.
A．reaching
B．to reach
C．being reached
D．having been reached
单项选择题
______ the news, Ida changed her plans.
A．In hearing
B．To hear
C．Of heating
D．On hearing
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