求教GWD28-Q20。。。想了好久也想不明白

raynichole

GWD28-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

请问这道题中anthracite coalfields opened in eastern Pennsylvania在句子中做什么成分，既然跟E选项中as canals and eventually railroads reached into the region并列，为什么前面没有连接词呢？



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

请问这道题中anthracite coalfields opened in eastern Pennsylvania在句子中做什么成分，既然跟E选项中as canals and eventually railroads reached into the region并列，为什么前面没有连接词呢？

kwok1123

这里and只是普通连词连接两个完整的句子吧

兰心寒

anthracite coalfields opened in eastern Pennsylvania应该是和substantial supplies of coal were exported to the nation’s growing mills, forges, factories, and railways并列的。这也是一眼就排除其他几个选项的一个快速方法，个人感觉～