og73E选项:Researchers studying volunteers' brain scans while [they] pondered ethical dilemmas have found that the basis for making tough moral judgments is emotion, not logic or analytical reasoning.
og解释说因为volunteers'是所有格,所以they在语法上只能指代researchers,与逻辑主语volunteer不符,为什么语法上不能指代brain scans呢?
og81c选项:The Olympic Games helped to keep peace among the pugnacious states of the Greek world when [they] proclaimed a sacred truce for the festival month.
og解释说they语法上可以指代olympic games也可以指代states因此是ambiguous的。
这两选项放一起看让我对they的指代有些晕,所以想请教一下各位大神。