According to the report ,the railway ____ now will cut the journey time between the two cities by ar

According to the report ,the railway ____ now will cut the journey time between the two cities by ar

题目
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
答案
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.
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