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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No sooner had they got off the train ______ it started moving.
A．when
B．than
C．then
D．after
单项选择题
This new instrument is far superior ______ the old one we bought three years ago.
A．than
B．to
C．over
D．of
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