单项选择题

Being color-blind, Sally can't make a ______ between red and green.

A．difference
B．distinction
C．comparison
D．division
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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
She did her work ______ her manager had instructed.
A．as
B．until
C．when
D．though
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