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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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
You should know better than ______ the risk of gambling.
A．to run
B．running
C．to have run
D．ran
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