The Chicago and Calumet Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing canals so that the water now empties into the Mississippi by way of the Illinois River.
The Chicago and Calumet Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing canals so that the water now empties into the Mississippi by way of the Illinois River.
(A) Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing (B) Rivers had originally flowed into the St. Lawrence by way of Lake Michigan, but they have been redirected by constructing (C) Rivers, which originally flowed into the St. Lawrence by way of Lake Michigan but have been redirected by the construction of (D) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, but having been redirected by the construction of (E) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, have been redirected through the construction of 答案是e没什么问题,但是这里用flowing我总觉得不大好。分词有同时的意思吧,这里逻辑上应该是没有同时的意思。大家讨论下。