another bridge has being built over the river 怎么翻译?

原句有误.another bridge has been built over the river 河上又建成了一座桥
another bridge is being built over the river 河上正在修建又一座桥其实我就是觉得有问题才问的= =恩，上面是两种改法，一种是完成式，一种是进行式