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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 now currently 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,这个用now current 排除 但我不明白,OG上的解释上说必须用existed, 不能用had exist. 这个不大明白 这个an age when ice sheet应该在led 之前出现的,应该用过去完成时? |
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