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

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

admin2010-04-24  59
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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