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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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
单项选择题
He ______ in his company since he graduated from Andong Technical College ten years ago.
A．worked
B．has been working
C．had worked
D．was working
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