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
这个题目的答案是E，OG给的解释说D用了被动语态不好，所以应该用E。
我有两个地方不是很想得通：
1，一般一个表示目的得动词不定式短语用在句末的话，前面不用逗号与主句分开的，但是E这么做了。
2，D虽然用了被动语态，但是和后面的partly because形成了很好的平行，难道保持主动语态比保持平行结构要重要吗？
first of all, ETS doesn't prefer passive voice, that's the rule, don't doubt it.
Second, E is the best, but may not be the perfect or 100% correct choice.
Hope it is helpful.
这道题目其实可以理解成后向省略。
partly （because crossbreeding is said ）to acquire certain characteristics in their steers and partly because crossbreeding is said to provide hybrid vigor.
这样就ok 了。。。
Dear all,
Thank you very much!
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