131-18. 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.
B. and its superiority over the horse had been
C. and its superiortity to the horse
答案是B， 可我觉得C更好，省略了the horse (was) proved...而且前后事态一致，B的时态有问题。
谢谢！
白勇的语法对于培养做题的感觉是没用的，因为上面的题很少是官方题库里的，很多都是中国人出的，思维和角度都有偏差，但是能锻炼你分析语法的准确性和敏感性
如果快考试了，还是建议你以OG为主
131-18. 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.
B. and its superiority over the horse had been
C. and its superiortity to the horse
答案是B， 可我觉得C更好，省略了the horse (was) proved...而且前后事态一致，B的时态有问题。
谢谢！
选Ｂ的理由：
C的主语是：motor car's superiority to the horse, 而不是 motor car, 所以，助动词不能省.另外，两者比较，over比to好．
时态不能解答，是不是，最初当motor car 比horse的优势得以证明后,其经济和社会价值才得以进一步体现？
．
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