单项选择题

With all its advantages, the artificial intelligence is by no means without its

A．boundaries
B．restraints
C．confinements
D．limitations
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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
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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