More than five thousand years ago, Chinese scholars accurately described the flow of blood as a continuous circle controlled by the heart, but it went unnoticed in the West.
(A) but it went
(B) but it was
(C) although it was
(D) but the discovery went
(E) although the discovery was
Highlight to see answer: D
Please post your explanations in the comments below!
(D) but the discovery went
(E) although the discovery was
what is the different?
The main difference between D and E is that answer D is in active voice, while answer E is in the passive voice.
Active voice is almost always preferred on the GMAT because passive voice has a tendency to sound awkward.