单项选择题

It cost her a lot of money, but she doesn't regret () a year traveling around the world.

A. to have spent
B. to spend
C. spent
D. spending

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单项选择题
With the introduction of the computer, libraries, today are quite different from they were in the past.()

A. that
B. what
C. which
D. those
单项选择题
He is used to flying by air and on no occasion () frightened.

A. he has ever felt
B. be ever feels
C. ever does he feel
D. has he ever felt
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