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GMAT考试的代词，必须明确是指只有一个指代的词。如果句子中有两个或两个以上的名词则应重新考虑代词的适用性。
◆ Researchers claim to have developed new “nano-papers” incorporating tiny cellulose fibers, which THEY allege give THEM the strength of cast iron.
上例中they 和them 指代什么?t我们可以假设hey指代researchers 而them指代new “nano-papers.”，但是事实上they 和them的指代都不是很明确，任何一个都可以指代researchers 或者 “nanopapers.”所以这句我们可以这样改写：
◆ Right: Researchers claim to have developed new “nano-papers” incorporating tiny cellulose fibers, which allegedly give THESE MATERIALS the strength of cast iron.
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