举报
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.
还是支持A。
C实在是有点恶心
还是c好点...
第1次碰到 with...being 是正确答案的!
看到with...being ,我上来就排除了C;考试别碰到这种题就行!
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