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B。 我的问题是，为什么这里用过去式，而不用过去完成式，不是前面有led 提示吗？表明在study led 之前 exist 这个动作就结束了？
作者: iamwwh 时间: 2004-3-17 11:35
我想是因为前面an age in which表示过去的一个时间吧, 所以用一般过去时作者: dansy 时间: 2004-3-17 14:22
bryony， 这题考的不是时态问题。A中now和currently重复。C罗嗦，E中now的位置不对。还有就是in which优于when(介词加whcih优先)，在in which用在句子没有错误时。