大全03-13

13.   The medieval scholar made almost no attempt to investigate the anatomy of plants, their mechanisms of growth, nor the ways where each was related to the other. B

(A) nor the ways where each was related to the other

(B) nor how each was related to some other

(C) or the way where one is related to the next

(D) or the ways in which they are related to one another（D）

(E) or the ways that each related to some other

不明白D为什么用现在时，前面都用的过去时态啊？

请教各位谢谢!

or the ways in which they are related to one another

因为他们之间的相关性延续到现在，现在也是这样的一个相关性。