The fifth generation computers, with artificial intelligence, ______ and perfected now.

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问题 The fifth generation computers, with artificial intelligence, ______ and perfected now.

选项 A、developed
B、have developed
C、are being developed
D、will have been developed

答案C

解析根据题干，所填空的时态应是被动语态，所以排除A 和B 。句尾的now提示应选择现在进行时的被动式，故答案为C 。

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专业英语四级

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The fifth generation computers, with artificial intelligence, ______ and perfected now.

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