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  3. The fifth generation computers, with artificial intelligence, ______and perfected now.

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 本题中句子的主语computers和谓语动词develop之间是被动关系，故首先排除选项A、B。时间状语now表示谓语是现在正在进行的动作，故选C。
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