单项选择题

You should be able to ______ right from wrong.

A．perceive
B．distinguish
C．sight
D．observe
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单项选择题
I m pleased to tell you that the fax machines you ordered are ______ now.
A．available
B．convenient
C．wonderful
D．important
单项选择题
Those ______ are interested in the job position need to send an email to us.
A．what
B．whom
C．which
D．who
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