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
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
单项选择题
The representative of the company demanded that part of the agreement ______ revised.
A．will be
B．is
C．to be
D．be
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