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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
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.
still, you can rule out choice d for other reasons:
* 'seemed to be using': unacceptable change of meaning. the past-tense 'seemed' says that that's the way it seemed to the mayans living in cancun long ago, whereas the sentence is clearly designed to say that's the way it seems to us now.
* i don't like 'in becoming', which smacks of what the gmat would call 'idiom error'. there's no answer key for these things, of course, but i do have the feeling that the gmat would label this as an idiom error.
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