The Anasazi settlements at Chaco Canyon were built on a spectacular scale with more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.
with more than 75 carefully engineered structures, of up to 600 rooms each, were
with more than 75 carefully engineered structures, of up to 600 rooms each,
of more than 75 carefully engineered structures of up to 600 rooms, each that had been
of more than 75 carefully engineered structures of up to 600 rooms and with each
of more than 75 carefully engineered structures of up to 600 rooms, each had been
错选E: ,each had been connected 不是独立主格,他是一个完整句,两个完整句缺乏连词,e错
, each connected 才是独立主格
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