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
Your sister has made an ______ for you to see the dentist at 3 this afternoon.
A．appointment
B．interview
C．opportunity
D．assignment
单项选择题
No one can be sure if the car on display fits him or her until he or she ______ them.
A．tries
B．will try
C．are trying
D．have tried
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