GWD19 一道语法题

suntao0209

In the 1820’s, anthracitecoalfieldsopened 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

答案是E，让在下想不通的是A错哪了。哪位大侠指点一下。。。

而且  E中出口的主语是supply   感觉逻辑不通啊…………

Jackjokes

A 错在“there were substantial supplies of coal that was“ that 修饰的是 supplies 应用复数形式were
简言之 就是A of B that ... that 修饰的是A

希望能帮到你，good luck~

Jackjokes

而E 选项中 supplier的意思 是"供应", 供应还是能够被exported的