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  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 本题测试时态及语态。动词需用被动形式，可先排除A、B两项，C和D的区别在于时态不同，根据句尾的now，应选择现在进行时的被动式。故C正确。
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