Researchers at the University of Colorado are investigating a series of indicators that co
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Researchers at the University of Colorado are investigating a series of indicators that could help themselves to predict earthquakes.
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正确答案：themselves--them
考查反身代词。只有当主语和宾语为同一人物或事物时，宾语才可用反身代词。此句为复合句，定语从句的先行词为indicators，而此处指的是主句的主语Researchers，所指不一致，不能用themselves，故应改为them。