单项选择题

She did her work ______ her manager had instructed.

A．as
B．until
C．when
D．though
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单项选择题
You needn't worry ______ regards the cost of the operation.
A．with
B．which
C．as
D．about
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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