关于这个系动词是用BE还是GO？

qiqi_cola

885   04-10

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

sprog

go作为系动词用的时候有 处于......的状态的意思，用在这里比较恰当。