标题: 求助题目，不明白书上的解释，请大家帮忙解释一下吧！ [打印本页] 作者: momo891 时间: 2010-11-15 11:58 标题: 求助题目，不明白书上的解释，请大家帮忙解释一下吧！ 我是在白勇的《GMAT语法大全》里的第172页看到的，是第49道题。 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】 我不明白的是，and 后面的partly because 带了crosebreeding is said to provide hybrid vigor不是一个句子吗？那么是不是说and前面要对称，也要带一个句子？ 答案选择的E选项不是一个不定式？不定式可以和句子并列吗？这样对称吗？ 这里的partly to acquire…是不是crossbreeding的目的？那是什么成分？和后面带的because…的成分相同吗？是不是成分不相同的都不能并列？ D选项为什么错？为什么书上说should使得句子的逻辑意思不正确，那是不是没有这个should就正确了？因为这个should情态动词表示了一种态度而原句中没有态度的表示？但是D选项改变了原先主动的状态吗？ 还有我想问一下“，”后面的并列结构在整个句子中是什么成分？是状语吗？