单项选择题

People appreciate_________ with him because he has a good sense of humor.

A．to work
B．working
C．to have worked
D．have working
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单项选择题
All the arrangements should have been completed prior________ our departure.
A．in
B．to
C．by
D．before
单项选择题
________is known to all, too much smoking will cause lung cancer.
A．That
B．It
C．As
D．What
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