Shanghai was/is the first city to+...was/ is两种情况时后面的内容怎么区分?

Shanghai was/is the first city to+...was/ is两种情况时后面的内容怎么区分? Shanghai is the city where I was born Shanghai is the city where I was born,为什么用where,不用which,wher it is the first time和it was the first time后面接的时态各是什么? 1.内容:The city _______ I was born is on the new railway line. this is the first time this was the first time 怎么用,有什么区别? Shanghai is not the city __ it used to be Shanghai is the first city in the world ____a high-speed mag 1、Shanghai is the first city in the world___a high-speed tra The girl was the first to pass the finishing line.前面是was后面用p 1.Who was the first one to arrive?2.The house is comfortable It is the first park in the world that was made to be seen a