| GWD7-Q39: Seldom more that 40 feet wide and 12 feet deep, but it ran 363 miles across the rugged wilderness of upstate New York, the Erie Canal connected the Hudson River at Albany to the Great Lakes at Buffalo, providing the port of New York City with a direct water link to the heartland of the North American continent.
A.Seldom more than 40 feet wide and 12 feet deep, but it ran 363 miles across the rugged wilderness of upstate New York, the Erie Canal connected B.Seldom more than 40 feet wide or 12 feet deep but running 363 miles across the rugged wilderness of upstate New York, the Erie Canal connected C.It was seldom more than 40 feet wide and 12 feet deep, and ran 363 miles across the rugged wilderness of upstate New York, but the Erie Canal, connecting D.The Erie Canal was seldom more than 40 feet wide or 12 feet deep and it ran 363 miles across the rugged wilderness of upstate New York, which connected E.The Erie Canal, seldom more than 40 feet wide and 12 feet deep, but running 363 miles across the rugged wilderness of upstate New York, connecting ------------------------------------------------------------------------------------------------------------ 老师A错在哪里呀，好像木有问题呀！it指代好像也没问题 B的but后面用running，后面不是句子呀！奇怪
GMAT讲师robert详细解答回复可见：
句子结构为seldom..., but ..., the Erie Canal connected..., providing ...
A选项的主要错误在于but作为连词后面连接了一个主谓结构，但是but之前没有主谓结构与之对应
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