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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
B用了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，因此B是错的。
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