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
it & so 区别:
---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
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