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His studues 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. A.in which great ice sheets had existed in now currently temperate areas B.in which great ice sheets existed in what are now temperate areas D.when great ice sheets had existed ini current temperate areas. 答案选B。想知道D比B不好在哪了。是when不能用来修饰age吗? |
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