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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.
(A) in which great ice sheets had existed in nowcurrently temperate areas (B) in which great ice sheets existed in what are now temperate areas (C) when great ice sheets existed where there were areas now temperate (D) when great ice sheets had existed in current temperate areas (E) when great ice sheets existed in areas now that are temperate
答案是B,但是我选的D 看了OG的解释,还是不明白为什么不能用had existed?这不是在那人提出观点前已经存在了吗?发生在led之前,过去的过去? 还有就是为什么不能用current,必须要用currently?
多谢大家指导! |
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