Once the economic and social usefulness of ehw motoe car was demosteates and with its superiority to the horse being proved, much of the early hostility to it in rural regions disappeared.
A and with its superiority to the horse being
B ans its superiority over the horse had been
C and its superiority to the horse
D its superiority over the horse
E with its superiority to the horse having been
answer B
我认为B中的过去完成时用的没有道理,是绝对错误
这道题应当 选C 虽然不对称，但优于b
ＯＮＣＥ＂一旦＂有虚拟意味，虚拟时态
superiority over是固定的吧
同意lz,刚看题的时候以为需要被动语气，查了一下字典，发现prove可以做不及物动词，作“被显示”，在这里句意上也说得通。
动作先后发生次序上，demostrate（lz是不是笔误？）和prove可以是同时进行的，展示的同时显示出优势，所以用过去时。
superiority to 在金山词霸上也有 优势 的意思。不知道在郎文上的解释是什么（CD上的连接怎么下载不了呢？哪位好心人告诉一下）
这样看C选项好像没有错误。
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