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题库 / OG2016-SC-89
His studies of ice-polished rocks in his Alpine homeland, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets had existed in now currently temperate areas.
in which great ice sheets had existed in now currently temperate areas
in which great ice sheets existed in what are now temperate areas
when great ice sheets existed where there were areas now temperate
when great ice sheets had existed in current temperate areas
when great ice sheets existed in areas now that are temperate
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When 引倒时间状语从句，容易误解为在他propose这个concept的时候 冰川存在在那样的环境中。原文想表达的是在an age 的时候，所以要用对an age的修饰的定语从句。
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