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 will never forget the ten years ______ we both spent in the little village.
A．when
B．during which
C．which
D．in which
单项选择题
Having finished the letter, he ______ it carefully and sealed the envelop with a kiss.
A．folded
B．bent
C．turned
D．curved
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