专升本考试

【单选题】 The fifth generation computers, with artificial intelligence, ______ and perfected now.
A．developed
B．have developed
C．are being developed
D．will have been developed

网考网参考答案：C
网考网解析：
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。 查看试题解析出处>>