P132
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 it's superiority over the horse had been
C.and it's superiority to the horse
D.it's superiority over the horse
E.with it's superiority to the horse having been.
正确答案是B.请教NN为什么B后面要用过去完成时而不用过去时.
个人觉得最佳答案: and it's superiority over the horse,因为前面有be动词,顾在此的was可以省略.
请教各位NN都来谈谈自己的看法.谢谢大家. | 
