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(C)
(E) with its superiority to the horse having been
请问这题once...and ..., and 后不是应该接句子吗? C不是一个句子呀, 是不是少了一个 was 呢? 哪位NN解释一下...谢谢!
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