29. 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 proved D. its superiority over the horse E. with its superiority to the horse having been 答案是B 但我想问的是C 白勇的解释是"and连接once从句和名词短语its superiority, 两者形式不对称" 但是能不能将and後面看成"its superiority to the horse (was) proved"省略前面出现 过的be动词? 因为做这题的时候看不出and前後有何线索指出後面需要用过去完成式, 所以就把B删掉了. 请板上大大帮忙解答~感谢 --

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