Q20: In the 1820’s, anthracite coalfields opened in eastern Pennsylvania , and when canals and eventually railroads reached into the region, there were substantial supplies of coal that was exported to the nation’s growing mills, forges, factories, and railways. 就你的看法看来 我又发现了一个有利於E的证据了 exported後面to了4个地方 这就不应该是单数的「coal」做的到的事了巴？ 就跟你举例的例子home是单数所以用it的道理........ 是不是这样~~~~大 家 说 看 看............. --

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