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 根据题干，所填空的语态应是被动语态，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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