摘要： 现在进行时 的用法 例:The fifth generation computers, with artificial intelligence, and perfected now. A) developed B) have developed C) are being developed D) will have been developed 题中develop 和perfect是并列的两各位与动词.动词perfect只能做及物动词用.因此在本句中应为被动语态.与之并列作谓语的动词develop也应是被动语态.此外.句中时间状语now表示谓语应是现在正在进行的动作.由此可见.答案是C) are being developed.全句的意思是:"具有人工智能的第五代计算机目前正在开发和完善之中".

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