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[Sentence Correction]
试题详情
题目：
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.
选项:
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
答案:
B
提问：
of up.to 600 each.是插入语么？怎么判断，怎么理解
解答：
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