关于这道题，我是这样想的，想和大家讨论一下：
57.
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.
(A) with more than 75 carefully engineered structures, of up to 600 rooms each, were
(B) with more than 75 carefully engineered structures, of up to 600 rooms each,
(C) of more than 75 carefully engineered structures of up to 600 rooms, each that had been
(D) of more than 75 carefully engineered structures of up to 600 rooms and with each
(E) of more than 75 carefully engineered structures of up to 600 rooms each had been
OA：B A多了were，CDE改变了句意，时态也不对
关于B：of up to 600 rooms each修饰的是scale， connected修饰的是structures
而不是语法笔记里的"of , connected 都修饰structures."
不知道我是不是理解错了，恳请大家指正~~
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