单项选择题

By no means ______ our mistakes.

A．we ought ignore
B．we ought to ignore
C．ought we ignore
D．ought we to ignore
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单项选择题
You should be able to ______ right from wrong.
A．perceive
B．distinguish
C．sight
D．observe
单项选择题
No sooner had they got off the train ______ it started moving.
A．when
B．than
C．then
D．after
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