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Native to South America, peanuts were introduced to Africa by Portuguese explorers early in the sixteenth century and were quickly adopted into Africa’s agriculture, probably because they were so similar to the Bambarra groundnut, a popular indigenous plant.
pronoun ambiguity不是absolute rule,GMAT對這個有一定tolerance 另,雖然根據number,explorers和peanuts都有可能是antecedent,但meaning上antecedent應該是peanuts,而且peanuts是句子的subject-->所以they指代peanuts較優
hope that helps |
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