15. 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
答案是(C), 可我觉得不对
C中的"its"是代指"the motor car" 对吧.
我觉得 "汽车的优越性" ("its superiority")是"被证明"(被动式) 而不是"证明"(主动式)
我觉得C应该是
(C) and its superiority to the horse was
同问
刚想起来，比较结构中and 前后如果有相同的谓语动词可以省略
1. As the etched lines on computer memory chips have become thinner and the chips’ circuits more complex, both the power of the chips and the electronic devices they drive have vastly increased.
(A) the chips’ circuits more complex, both the power of the chips and the electronic devices they drive have
(B) the chips’ circuits more complex, the power of both the chips and the electronic devices they drive has
(C) the chips’ circuits are more complex, both the power of the chips and the electronic devices they drive has
(D) their circuits are more complex, the power of both the chips and the electronic devices they drive have（B）
(E) their circuits more complex, both the power of the chips and the electronic devices they drive have
这里面就省略了have become
哦, 有道理
.... the chips’ circuits (have become) more complex ...
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