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一个逗号引起的语法问题, 牛人帮忙

prep1-65

65. 

Developed by Pennsylvania's Palatine Germans about 1750, they made Conestoga wagons with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent cargo from shifting on steep grades.

(A) they made Conestoga wagons with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent

(B) they made Conestoga wagons, which had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and floors curved upward on their ends so that they prevented

(C) Conestoga wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and had a floor that was curved upward at both ends to prevent

(D) Conestoga wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and a floor that was curved upward at both ends to prevent 

(E) Conestoga wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and floors curving upward at their ends so that it prevented

D 中为什么可以是这样的结构: had wheels , and a floor. 为什么and前面要加逗号呢? 按照白勇的语法:A AND B结构啊,中间不需要逗号啊?

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这种结构没什么问题啊..

反正看上去满顺的

准备3年内学会4种语言

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因为其他选项都不对.....

用有没有逗号来判断有点太主观了吧,在其他选项都有明显错误的情况下,只能选D

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LS的解释很彪悍 哈哈
准备3年内学会4种语言

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呵呵

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在并列结构中A,B, and C, and D是可以的
况且E选项明显有错误,it指代不清。

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这个不是主要问题.

E中最主要的错误是floor的并列问题,从原文中可以看到,a floor是和high wheels并列的,但是E中这种并列关系被改变了.不仅严重改变了original meaning,逻辑上也是讲不通的.

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我的理解是

    E 中and使the prairie和floors修饰nonroads,逻辑上不对

    D 中的and后省略了had, had wheels+adj修饰语 and a floors that 平行

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 E 中的it指代明显不清

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