一道GMAT SCOnce the economic and social usefulness -----------

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一道GMAT SC
Once the economic and social usefulness
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Once the economic and social usefulness of the motor car was demonstrated {and with its superioty to the horse beinig }proved,much of the early hostility to it in rural regions disappeared.
(A) and with its superioty to the horse beinig
(B) and its superioty over the horse had been
(C) and its superioty to the horse
(D) its superioty over the horse
(E) with its superioty to the horse having been
你选哪一个,为什么?OA一会给出
我选的是C,能否告诉我C为什么不对
2楼的回答明显有错误啊,proved这个词可以是主动表被动啊.
到GOOGLE上一搜,很多人也选C,现在很费解啊

B
有and的地方要前后对称
这里选B的话 the motor car对应its
was对应had been
demonstrated 对应 proved
对应的非常完美
这里的ABC都以and开头一个派别
D用its直接接上一个句子也就是两个句子连在一起但是没有连词（and or之类的）肯定错
E用with想营造出独立主格结构的错觉但是据prep破解 with通常用于对动词的修饰表伴随状态这里明显不是修饰demonstrated
PS 语法的精髓就在对称这是考的最多的

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