白勇语法P128第18题
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.
B. and its superiority over the horse had been
C. and its superiority to the horse
白勇的答案是B。但我却认为应该是C。我的想法:C承前省略了was,was proved 和 was demonstrated 构成很好的并列。而B的had been用过去完成时却没有道理。
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