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.
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Ascale, with more than 75 carefully engineered structures, of up to 600 rooms each, were
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Bscale, with more than 75 carefully engineered structures, of up to 600 rooms each,
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Cscale of more than 75 carefully engineered structures of up to 600 rooms, each that had been
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Dscale of more than 75 carefully engineered structures of up to 600 rooms and with each
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Escale of more than 75 carefully engineered structures of up to 600 rooms each had been
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正确答案: B