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. A. when canals and eventually railroads reached into the region, there were substantial supplies of coal that was B. once canals and eventually railroads reaching into the region, there were substantial supplies of coal having been C. with canals and eventually railroads reaching into the region, there had been substantial supplies of coal D. canals and eventually railroads reached into the region, with substantial supplies of coal being E. as canals and eventually railroads reached into the region, substantial supplies of coal were 这题也是在A和E间争辨很久 我是选E 一开始不选A的原因是觉得there were很罗嗦 倒是没有注意到A中的was是指coal然後E中的were是supplies的问题 恩... 如果supplies of coal，supplies不能和coal黏在一起（不晓得大家懂我的意思吗） 因为我想supplies就是修饰coal,所以were是不是可以整个修饰「supplies of coal」 如果不能黏在一起的话，那E就真的是错的 毕竟A这边 there are後面加上自然形成的N (这边放了substantial supplies of coal) 是没问题的..... PO上来问问大家的意见如何........ --

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