一道关于不定式的英语选择题
(B）Shanghai is the first city in the world_____a high-speed maglev train,from the city to Pudong Airport.
A.to built
B.to have built
C.to be built
D.to have been built
我知道选择的依据是看谓语动词和不定时动作的发生时间关系,可是这句话怎么判断is和built的时间关系呢