[讨论]OG11th补充教材——SC22

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

答案是E

OG对D的解释是：Passive voice should be acquired by is awkward and illogical

个人觉得，是不是两个partly because 重复出现是主要的原因呢？