题目

The fifth generation computers, with artificial intelligence, ________ and perfected now.A. developedB. have developedC. are being developedD. will have been developed

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

A. developed

B. have developed

C. are being developed

D. will have been developed

题目解答

答案

C. are being developed

解析

考查要点：本题主要考查被动语态的现在进行时的用法，以及时间状语now对时态选择的影响。

解题核心思路：

  1. 判断语态：句子主语"The fifth generation computers"是动作的承受者，需用被动语态（be + 过去分词）。
  2. 确定时态：时间状语"now"提示动作正在发生，需用现在进行时（be + being + 过去分词）。
  3. 排除干扰项：注意区分完成时、将来时等其他时态的结构。

选项分析

  • A. developed：缺少be动词，无法构成被动语态。
  • B. have developed：主动语态的现在完成时，与主语逻辑关系不符。
  • C. are being developed：现在进行时的被动语态，符合"now"表示动作正在发生的语境。
  • D. will have been developed：表示将来完成，与时间状语"now"矛盾。

关键结论

"are being developed" 正确表达了“第五代计算机正在被开发”的被动过程，且与"now"一致。