单项选择题

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

A．known
B．to be known
C．knowing
D．having known
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单项选择题
She didn't know ______ to express her ideas clearly when she was invited to speak at a meeting.
A．where
B．why
C．what
D．how
单项选择题
My boss said that he was badly ______ need of my assistance.
A．at
B．in
C．for
D．with
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