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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In the（）half of the 17th century those cities became even more prosperous.

A、 latter
B、 latest
C、 later
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I didn't understand at first why he couldn't pass the test, no matter（）hard he had tried.

A、 when
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