单项选择题

The professor, () as a splendid speaker, was warmly received by the students.

A. known
B. knowing
C. to be known
D. having known

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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
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
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