大全 sec10-15 (沒人問過!快考了!拜託大家)

    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（C）

(E) with its superiority to the horse having been

答案的C中為什麼沒有was~~可以隨便省嗎?? 我選B! B的時態為什麼不對? 不能認為its superiority over the horse被証明的時間點比 the economic and social usefulness of the motor car was demonstrated 早嗎???  拜託大家幫助!

同问，帮你顶！

不好意思，因为还没做大全所以。。。

看看下面联接吧，找找答案

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=81938&page=1

加油！：）

主语不一样, “be” 动词可省.

OG218: levels of bacteria in seawater at popular beaches be measured and the results published => notice no "be" infront of "published"

"Once A and B" => A and B occured simultaneously

用题目的主干分析：

usefulness was demonstrated and proved.

was 之后 demonstrated and proved 是并列的。

我也选C

但是看到白勇的语法大全答案是B

到底哪个对呀？求解答！！！