Sentence Correction
试题详情
题目：
Unlike other Mayan cities, Canc??n'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.
选项:
A、Canc??n'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
B、Canc??n'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
C、the commercial power of Canc??n 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
D、Canc??n 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
E、Canc??n 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
答案:
E
提问：
我能通过比较对象排除ABC。剩余DE如何比较呢？我能根据to become选出D。但有几个问题：
seemed to be using 和 seems to have used 的区别是啥？
逗号+which was a source of 和 逗号+ a source of 的意思是一样的吗？都是修饰前面的名词foot of the highlands吗？
in becoming 和 to become 中，我觉得to become表达更好，表示目的。那 in becoming 表达的意思是什么呢？
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