Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore. C) With charcoal's being replaced by coal as the fuel used in the smelting of iron ore and several improvements in blowing machinery , the average output of ironwork tripled over the eighteenth century. 想请问各位大大这题 这题真的想了很久不太清楚为啥答案是C 唯一觉得A有可能不会对的原因只有 not parrall (as a result........and because) C的 With charcoal's being也很诡异 thanks --

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