China's high﹣speed railways _____ from 9,000 to 29,000 kilometres in the past few years.( )
A.are growingB.were growing
C.will growD.have grown
China's high﹣speed railways _____ from 9,000 to 29,000 kilometres in the past few years.( )
A.are growingB.were growing
C.will growD.have grown