本贴相关题目 TN-19-SC-20 (YVVQ)

00:00:00

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.

Awhen canals and eventually railroads reached into the region, there were substantial supplies of coal that was
Bonce canals and eventually railroads reaching into the region, there were substantial supplies of coal having been
Cwith canals and eventually railroads reaching into the region, there had been substantial supplies of coal
Dcanals and eventually railroads reached into the region, with substantial supplies of coal being
Eas canals and eventually railroads reached into the region, substantial supplies of coal were

正确答案: E

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mijianture

电梯直达

楼主

发表于 2011-5-25 15:21:43 | 只看该作者回帖奖励

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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.

when canals and eventually railroads reached into the region, there were substantial supplies of coal that was
once canals and eventually railroads reaching into the region, there were substantial supplies of coal having been
with canals and eventually railroads reaching into the region, there had been substantial supplies of coal
canals and eventually railroads reached into the region, with substantial supplies of coal being
as canals and eventually railroads reached into the region, substantial supplies of coal were

E的as在这里表达什么意思？