今天的答案似乎很有问题~难倒我错了？？

yaoxiayi

93.    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

答案给了E~可能吗？不是D吗？

silent7706

这题答案是E), 没有问题。

yaoxiayi

为什么呢？？？

silent7706

(D) partly because certain characteristics should be acquired by their steers ("should" 太主观)

yawgamoth86

D而且囉唆了 不如to do不定式簡潔