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题库 / Prep2007E2-SC-32
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.
Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing
Rivers had originally flowed into the St. Lawrence by way of Lake Michigan, but they have been redirected by constructing
Rivers, which originally flowed into the St. Lawrence by way of Lake Michigan but have been redirected by the construction of
Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, but having been redirected by the construction of
Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, have been redirected through the construction of
AB： by contrusting, 意味着，rivers主动去construct, 不正确：by constructing 是状语修饰be redirected因此需要判断construct的发出者，这里用状语默认是主语发出这个动作，可是主语不是发出者，而是动作的对象
CD: 无谓语
CD没有谓语
选项B had done时态错误，originally用过去时
选项C which的使用使得which后面所有内容变成修饰rivers,整个句子没有谓语
选项D 整个句子没有谓语，
选项E 正确 The Chicago and Calumet Rivers have been redirected through the construction of canals