大全 512 went unnoticed

1.        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

答案(D)

D和E到底有什么区别？而且这种go,come后接否定形式的过去分词的用法，有那位大侠比较清楚？

是ALTHOUGH 和BUT的区别

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可以详细说一下吗?