问题
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
答案
答案：C
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The fifth generation computers, with artificial intelligence, _____ and perfected now.
A．developed
B．have developed
C．are being developed
D．will have been developed
答案：C