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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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曼哈顿说where引到定语从句时不能修饰有暗喻性、抽象的的地点（a “metaphorical” place），比如condition，situation，case，circumstance，arrangement，而改用in which。所以when是不是也同理？
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