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
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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