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
The team's efforts to score were ______ by the opposing goalkeeper.
A．frustrated
B．prevented
C．discouraged
D．accomplished
单项选择题
There is no doubt ______ the company has made the right decision on the sales project.
A．why
B．that
C．whether
D．when
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