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42．Qingzang Railway two years ago. Now more and more people enjoy going to Tibet by train. A．is built B．has been built C．was built D．will be built 【查看更多】

 

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Qingzang Railway ____ two years ago. Now more and more people enjoy going to Tibet by train.

A．is built      B．has been built   C．was built   D．will be built

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