单项选择题

The wood was so rotten that, when we pulled, it ______ into fragments.

A．broke off
B．broke away
C．broke through
D．broke up
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单项选择题
Gasoline is ______ by the spark plugs in the engine.
A．ignited
B．inspired
C．excited
D．illuminated
单项选择题
The students have been working ______ for years for the public examination.
A．readily
B．industrially
C．objectively
D．industriously
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