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
When the boy came back years later, he found ______ the empty old house there.
A．none but
B．none other than
C．nothing but
D．no other than
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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