单项选择题

You should know better than ______ the risk of gambling.

A．to run
B．running
C．to have run
D．ran
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单项选择题
Nancy was surprised that they have______. They seemed to be a happy couple.
A．split up
B．broken down
C．fallen through
D．cat off
单项选择题
In 1914, an apparently insignificant event in a remote part of Eastern Europe ______ Europe into a great war.
A．plunged
B．imposed
C．pitched
D．inserted
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