The Anasazi settlements at Chaco Canyon were built on a spectacular scalewith more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.
A. with more than 75 carefully engineered structures, of up to 600 rooms each,were :were has no subjects
B.with more than 75 carefully engineered structures, of up to 600 rooms each, correct
C. of more than 75 carefully engineered structures of up to 600 rooms, each thathad been :past perfect
...
A. with more than 75 carefully engineered structures, of up to 600 rooms each,were :were has no subjects
B.with more than 75 carefully engineered structures, of up to 600 rooms each, correct
C. of more than 75 carefully engineered structures of up to 600 rooms, each thathad been :past perfect
...
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