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fangtray
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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
Why does had existed not work here? these ice sheets existed in the past...and Louis proposed this concept in the past. SO how come past past tense doesn't work?
Why does had existed not work here? these ice sheets existed in the past...and Louis proposed this concept in the past. SO how come past past tense doesn't work?












