SC改错求助，不定式和状语从句的并列

s2206001

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
key E
my choice D

这题目是白勇语法大全那本书上的例题，我觉得答案给的有点问题。我当时选的D，是因为考虑到从句的并列，虽然should用的不好。但是，白勇给的答案是E，我觉得E是不定式啊，而且表目的，怎么能和后面的原因状语从句并列呢？请大伙帮忙分析分析。谢过~~~

s2206001

O(∩_∩)O谢谢

bdsjb116

http://forum.chasedream.com/GMAT_SC/thread-42391-1-1.html