单项选择题

You must explain to us how they succeeded _____ the experiment.

A．for
B．at
C．in
D．to
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单项选择题
Our plane _____ from New York at 6:00 yesterday evening.
A．took off
B．put off
C．flew off
D．left off
单项选择题
The silence of the library _____ only by the sound of pages being turned over.
A．has been broken
B．was broken
C．broke
D．breaks
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