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题库 / GMATLA-SC-94
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
题目分析：本题的意思是：
当运河和铁路到达地点时，很多的煤炭会被运输出去。
选项分析：
选项A：本选项语法没有问题，但是when连接的两个句子之间不存在时间关系。主句there were substantial supplies of coal是there be句型，其核心词为“有”。在逻辑上， 我们不能说：
当运河和铁路到达地点时，这里有很多的煤。
这是因为，无论运河到不到达这个局域，这个区域中的煤都是一直存在的。
选项B：两句话之间没有逻辑关系错误同选项(A)。分词短语having been不正确。在现在分词或不定式中加have表示先时性。到本选项中，其表示，在“有”足够的煤之前，煤就已经被运出去了，这显然是不符合逻辑的。
选项C：两句话之间没有逻辑关系错误同选项(A)。
选项D：本选项中的主句为canals and eventually railroads reached into the region。在划线部分身前出现的句子是anthracite coalfields opened in eastern Pennsylvania。这两句话没有并列关系。在逻辑上，是“煤矿被开采”和“煤矿被输出”之间形成并列关系。
选项E：Correct. 本选项在语法和逻辑上均是正确的。
选项A was不对，that 从句修饰supplies
选项B once后面缺动词
选项C had been时态错误
选项D being多余；with substantial部分变成伴随，改变句子重心
选项E 正确
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