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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：
老师我想请问，这道题我现在就在BD里选，我不太明白B的选项里，of前面加了一个逗号是否还是能和structure连接在一起，我对于像B里面的介词前面为什么要加逗号一直很奇怪
解答：
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