PREP 32题

beMe

32.(26170-!-item-!-188;#058&003042)

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明白了，但语法笔记写在GMAT语法中，通常是by+noun正确，放在这儿解释这题，这我就不明白了

winny0821

by 后面是动作的发出者
你倒过来念
construction redirect rivers 逻辑不合理

如果不对请指教