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题库 / GMATLA-SC-37
The first English settlers to establish a permanent colony in America did it not at Plymouth but along the shore of the James River west of Chesapeake Bay.
it not at Plymouth but
so not at Plymouth but
not at Plymouth but instead
not at Plymouth but did so
it not at Plymouth but rather
2.平行触发语 not..but...因此D选项错误
选项分析：
A选项：【代词it的指代对象只能是名词而不能是一个句子或动词】但是在逻辑上，第一个英国的居住者做的事情应该是[establish a permanent colony这件事]，因此只能用did so而不能用did it。
not…but… 要求连接两者平行
---by ruqi
choice a, 代词it能够指代的对象只有单数名词colony, 语意不正确
choice b, did so指代了establish a permanent colony。 correct
A/E. it指代不清；did的应该是establish a permanent colony这件事；只能用did so, not did it
C. did缺少宾语
choice a, 代词it能够指代的对象只有单数名词colony, 语意不正确
choice b, did so指代了establish a permanent colony。 correct
choice b, did so指代了establish a permanent colony。 correct