白勇书上矛盾的题还要出两次...大家来看看这个.

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

(E) with its superiority to the horse having been

P128,P159都有这道题目，还出两遍...而P12页上面有个例句就是选C时候的句子。

P128,P159题目的答案选的是B,但是我觉得应该是C。正如12页里所说，平行结构前后都用了be动词后面的是可以省略的，即：and its superiority to the horse (was) proved 。

大家怎么看呢？B的时态改变貌似没有理由啊

同感 虽然B的over要好一些

Once A is B, and C D, 主 谓 宾.

A  C 名词

B D 形容词

后面C与D中间的Be就可以省略.  只要前后Be的功能是一样的就可以,如都是连接名词形容词.或者都是连接名词和分词(ing,ed)....

至于前后be的单复好象可以不考虑,做到过GWD里面一题,正确答案,前后,一个是was,一个是were单复数不同,省略了.但这个观点也受争议,因为可能是其他选项别的地方错太多了.

语文不好，不知道表达清楚没有.