单项选择题

You needn't worry ______ regards the cost of the operation.

A．with
B．which
C．as
D．about
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单项选择题
As the manager was away on a business trip, I was asked to ______ the weekly staff meeting.
A．preside
B．introduce
C．chair
D．dominate
单项选择题
The ______ of the world is unknown, but it is certainly not from Greek.
A．origin
B．generation
C．descent
D．cause
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