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

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

单项选择题

I promised to look （） the matter as soon as I got there.

A．for
B．in
C．into
D．after

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