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

（）the news, Ida changed her plans.

A．In hearing
B．To hear
C．Of heating
D．On hearing

单项选择题

I didn' t understand at first why he couldn' t pass the test, no matter（）hard he had tried.

A．when
B．where
C．what
D．how

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