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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______ the news, Ida changed her plans.
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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
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