1. 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
白勇认为是B，说C不对的原因是 and边接once 从句和名词短语its superiority两者形式不对称
我觉得他的说法有问题，原因：
1.C答案也是一个从句,动词是proved
2.根据be动词省略规则，如果两个be动词都是助动词，后面一个可以省略，所以实际上是：once xxx was demonstrated and xxx was proved, much of xxx.
3.b改用过去完成时态，在once这条件句中好像没这种玩法吧，所以B是错的。
不过longman上只有
superiority over和superiority of的用法
superiority of
the supposed superiority of the male sex
superiority over
the intellectual superiority of humans over other animals
superiority in
US superiority in air power
我选B
C
The answer is in the Bible.
en,which bible?
would you like to tell me more about the bible, thanks a lot.
There is only ONE Bible.
Isaiah 46:1-13 The LORD's Superiority to the Gods of Babylon
我觉得b是对的
1）proved应该用被动
2）be动词只在接表语的情况下省略吧？
3）once从句不能够有完成时的依据是什么？
我觉得b是对的
1）proved应该用被动
(was) proved - 省了was
2）be动词只在接表语的情况下省略吧？
OG218: levels of bacteria in seawater at popular beaches be measured and the results published
3）once从句不能够有完成时的依据是什么？
Once A AND B vs. Once A AFTER B
Once A AND B vs. Once A AFTER B
这个什么意思？
是吗？
有and，时态都是平行的？
关键是无法判断时态不平行的理由。
还有，呵呵 bible小写我当朋友说的是 gmat有什么bible：）
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