2. 外语
  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 时态题。根据最后一个分句的结构可以判断，and连接两个并列谓语动词，且perfected是及物动词的被动语态，所以所选动词一定是被动结构，排除A 、B 。选项D 表示的是将来时，与原题中的时间状语“now”不符，所以正确答案为C 。
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