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

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• 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 first city in the world ____a high-speed maglev train,from the city to Pudong Airport.A、to build B、to be built C、to have built D、to have been built 答案是C说上海是建造的执行者,怎么会呢明明是被建造啊!
• Oh,it'sso cold here,Somebody ____ the window,please?A closes B close Cshall close Dwill close