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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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【求教】请问老师B和E的区别，我觉得in which和when区别不大？所以是因为in what are now temperate areas比in areas now that are temperate要好？虽然说后者比较啰嗦，但是句子的意思还是表达出来了，为什么前者更好呢？求解答
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