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：E
partly because 不是应该对应partly because 平行的吗？为什么这题选E？答案认为D被动语态awkward，是不是说明简洁性比平行结构要重要？
问题2：请解释obtaining an investment-grade rating will keep the county's future borrowing costs low 和To obtain an investment-grade rating will keep the county's future borrowing costs low的区别。
不定式和VING做主语在GMAT中有什么区别
这个题目真正要写得比较漂亮的话：应该是这样的：In recent years cattle breeders have increasingly used crossbreeding, partly because they want their steers to acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.
