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kman
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for option B, "constructing" looks awkward also
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JohnLewis1980
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kman
169. 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

Hi mates,

IMO E

A is akward and also present perfect continuos is not needed
B out: past perfect should be "cut" by past simple and not by present perfect
C out: a main verb for rivers is needed
D out: same as in C and also, present perfect continuous sounds akward

OA and Source?

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OA is E. Source: GMATPREP SC
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ritula
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Agree with the explanation given by scthakur.
one shld prefer past perfect +simple past instead of past perfect +simple perfect



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