大全552=白勇4-18

Once the economic and social usefulness of the motor car was demonstrated 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) and its superiority over the horse had been

(C) and its superiority to the horse

(D) its superiority over the horse（C）

(E) with its superiority to the horse having been

白勇的答案是B。。我感觉不对。。对于C也不知解法。这题我就满是糊涂帐。。求救。。

c. its superiority是需要被证明的，应用被动语态。对于某物有优越性，用to/over是一样的。

我同意C

B时态错误, 这里没有必要用完成时

C里面:

In choice C, the best answer, the main predication usefulness…was demonstrated is paralleled by superiority [was] proved, with [was] omitted as understood.

就是说C里面的prove被动的be 动词, was 省略了,因为和前面的was demonstrated  平行