求教紫皮OG-SC-22题

22． In recent years cattle breeders have increasingly used crossbreeding，in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor
(A) in part that their steers should acquire certain characteristics
(B) in part for the acquisition of certain characteristics in their steers
(C) partly because of their steers acquiring certain characteristics
(D) partly because certain characteristics should be acquired by their steers
(E) partly to acquire certain characteristics in their steers

答案选E。但是为什么不选D啊？D选项的partly because... 和原文的partly because crossbreeding不是更平行一些吗？ETS的解释说D选项罗嗦，有点搞不清楚。

我个人觉得ets好象喜欢主动大于被动吧, 好几个题都是说用被动,难道是ets的偏好问题? 我选的也是D..