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
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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
单项选择题
The fifth generation computers, with artificial intelligence, and perfected now.
A．developed
B．have developed
C．are being developed
D．will have been developed
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