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
代词it的指代对象只能是名词而不能是一个句子或动词
not…but… 要求连接两者平行
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