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题库 / Prep2007E2-SC-71
Unlike other Mayan cities, Cancun's commercial power throughout the lowlands seems to be from using its strategic position at the foot of the highlands, which were a source of jade, obsidian, and other valuable commodities.
Cancun's commercial power throughout the lowlands seems to be from using its strategic position at the foot of the highlands, which were a source of jade, obsidian, and other valuable commodities
Cancun's commercial power throughout the lowlands seems to have come from using its strategic position at the foot of the highlands, a source of jade, obsidian, and other valuable commodities
the commercial power of Cancun throughout the lowlands seemed to have come from using its strategic position at the foot of the highlands, a source of jade, obsidian, and other valuable commodities
Cancun seemed to be using its strategic position at the foot of the highlands, which was a source of jade, obsidian, and other valuable commodities, in becoming a commercial power throughout the lowlands
Cancun seems to have used its strategic position at the foot of the highlands, a source of jade, obsidian, and other valuable commodities, to become a commercial power throughout the lowlands
关于D选项的疑问，RON大神的解释是说，D选项中的which修饰前面的highlands，第一个是meaning不对，第二是highlands是复数，动词的单复数也错了。但是RON有一期课讲“which”的用法时好像说过，which是可以修饰the NOUN + PRE PHRASE that immediately precedes the comma。那D选项中为什么不能理解成which是修饰strategic position（noun）+ at the foot of the highland (pre phrase)呢？
所以我觉得不是关注which这个地方。但是which指不到strategic position去，最多是说指代foot of the highlands / highlands 的问题
i do believe that we've seen examples in which relative pronouns stand for the entire phrase 'X of Y' rather than just the Y immediately preceding the comma, but that situation is rare indeed and should be avoided unless absolutely necessary (= it happens in all the choices, so you can't get away from it).
in this case, then, choice e, which avoids this whole relative-pronoun mess, is certainly preferable to choice d, which doesn't.
https://www.manhattanprep.com/gmat/forums/unlike-other-mayan-cities-t2560.html
这里应该是use to do这个split
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