Shanghai is the first city in the world a high-speed maglev train，from the city to Pudong Airport．
A. building
B. having built
C. to have built
D. built
网友回答
A. building
B. having built
(答案→)C. to have built
D. built
解析：考查非谓语动词。在英语中，由序数词修饰的名词后常用不定式作定语。句意：上海是世界上第一个建高速磁悬浮列车的城市，从城市到浦东机场。故C正确。