According to the report ,the railway ____ now will cut the journey time between the two cities by around 12 hours.
问题描述：
According to the report ,the railway ____ now will cut the journey time between the two cities by around 12 hours.
A built B being built
答
B 正在被建造的铁路 相当于which/that is being buit now A的话表示已经被建造.