Once the economic and social usefulness of the motor car was demonstrated [U]and with its superiority to the horse being [/U]proved, much of the early hostility to it in rural regions disappeared.
The answer is: and its superiority to the horse
My answer: and its superiority over the horse had been
Referring to the dictionary, I found that the prep added after superiority is "over"..作者: zhouyang1999 时间: 2003-1-14 03:18
the key issue is : no passive voice can be used on wordrove, to be proven is unidiomatic. superior to is idiomatic and origin answer is better.作者: Louisa_xy 时间: 2003-1-14 08:55
proved用的就是被动语态,省略了was
"and its superiority over the horse had been"-- had been时态不对作者: VICTOR_JZG 时间: 2003-1-14 13:24