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

So little （） about chemistry that the lecture was completely beyond me.

A. did I know
B. I know
C. do I know
D. I knew

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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