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 - subject verb agreement issue - supplies of coal needs was
B. once canals and eventually railroads reaching into the region, there were substantial supplies of coal having been - usage of having been
C. with canals and eventually railroads reaching into the region, there had been substantial supplies of coal - usage of past perfect
D. canals and eventually railroads reached into the region, with substantial supplies of coal being - usage of being
E. as canals and eventually railroads reached into the region, substantial supplies of coal were - Correct
Answer E
1. In case of option A, how do we determine whether THAT refers to coal or supplies of coal? Because both of them make sense to me.
2. Also, if change A to "when canals and eventually railroads reached into the region, there were substantial supplies of coal that
were", even then it will be inferior to option E?
3. Also, can you highlight the difference between
when and
as here?
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