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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.
scale, with more than 75 carefully engineered structures, of up to 600 rooms each, were
scale, with more than 75 carefully engineered structures, of up to 600 rooms each,
scale of more than 75 carefully engineered structures of up to 600 rooms, each that had been
scale of more than 75 carefully engineered structures of up to 600 rooms and with each
scale of more than 75 carefully engineered structures of up to 600 rooms, each had been
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A选项：were connected没有主语，因为structure是with杰斌段誉的宾语；
B选项：connected 做整个句子的谓语
C选项：each做一个新句子的主语；that had been connected by中that作为had been connected by的主语，所以没有动词；
D选项：此句子是这个题的意思发生改变，暗示the scale是由structures组成;and with each前面是600 rooms, 表示每个房间都是由。。。connected.
E选项：同c选项；each指代有问题
不是吧 b里不是有were做谓语了吗 connected是过去分词修饰each room
A were 前没有主语
C 时态had been 错
D and 前后不平行
E had been 错连接两个完整句子没有练词
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只要看出来connected修饰的是开头的settlement，就可以瞬间排除CDE
d. "with each connected……“好像是用来修饰room，所以不对
it doesn't make sense to use 'each' AFTER the comma, because it's not true that each structure was connected with a road system. instead, the road system connected all of the structures with each other, which is nowhere close to the same thing.
做了100遍了还是错。。。
CE的had been用的不对，C的each同位语修饰rooms，意思不对，E的each had been是一个句子，缺少连词
将 with 改变成 of 后，介词的修饰对象发生改变;原句 with 结构修饰 built,而 of 结构修饰的是 scale;
ACE是run on sentences, 排除。剩下A,D;connected by a complex regional system of roads用来修饰的是rooms，D的each语义有歧义，且并行结构不好，留下B.
主要搞清楚谁是插入语，这里应该是of up to 600 rooms each是插入语，去掉插入语，句子变成：
The Anasazi settlements at Chaco Canyon were built on a spectacular scale, with more than 75 carefully engineered structures were connected by a complex regional system of roads.
with...是独立主格，修饰补充a spectacular scale。这个规模有超过75个被一个复杂的道路系统相连的建筑，
插入语of...是修饰的这个structure，每个建筑有超过600个房间
analogy:
the USA comprises 50 states, each of which is united by a federal government --> wrong (the implication is that each state has its own federal government)
the USA comprises 50 states, all of which are united by a federal government --> correct
the USA comprises 50 states, (all) united by a federal government --> correct, whether you have 'all' or not
考察独立主格结构，with + 名词/代词 （宾格）+ 分词/动词不定式/形容词/副词/介词短语。此处，独立主格结构放在句末，表示伴随，对spectacular scale进行解释说明。
首先根据句子结构排除AE, 出现两个谓语动词；C had been时态不对。
当时纠结B,D，感觉B each后面那个逗号怪怪的。。
理解题意一下，connected 应该是修饰前面的structures 而不是紧跟的each，"of up to 600 rooms each" 就是一个完整的修饰语。
根据with each能判断D错了，独立主格里面这两个只能单独使用
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scale connected by，with插入语
with表伴随，进一步修饰built这个动作，句子结构应该是The Canyon were built on a scale with structures connected by a system. of up to 介词短语修饰 structures. connected的是structures
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看了毕出老师的书后，在实际应用逻辑来判断名词是否能被其定语分为两类时收益很大但遇到了这样一道题，貌似是有一点矛盾的想知道如何来判断。
A B修饰scale都用的非限制性修饰 CDE 用的是限定性，宏伟的规模肯定是可以被分为超过75个结构和不超过75个的，那么按照逻辑判断应该排除AB，同时后面的structure 也可以被600个房间分类，但是本题B是正确答案，都用的是非限制性修饰。求解
each of up to 600 rooms,,, soga soga
这道题还有点复杂，看了Manhattan 的讲解,"of up to 600 rooms“修饰前面的structure，是非限定性的，后面的connected by...也是修饰structure的。所以整句话是用了两个修饰短语来修饰structure。如果这个不明白，这道题就很难选对。
我以为with xxx只可以修饰就近noun？
https://www.manhattanprep.com/gmat/forums/the-anasazi-settlements-at-chaco-canyon-were-built-t2236.html
built on a spectacula scale, with more than 75 carefully engineered structures(, of up to 600 rooms each,插入语) connected分词修饰structure
connected的修饰对象应该是structures。