菜鸟提问------时态求救（含kaplan解释）～～～

fannybeibei

59.   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* concept of an age in which great ice sheets' existed in now currently temperate areas.


A)     in which great ice sheets had existed: 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


我选了d，觉得是过去完成时？？为什么不可以啊？
kaplan说，
Note the difference in meaning between these two sentences:
The Civil War had ended when Lincoln was shot. = The war was over by the time of Lincoln’s death.
The Civil War ended when Lincoln was shot. = The war ended when Lincoln died.

更不懂了，有人能中文解释下上面这两句有什么不同吗？？？

kingapple25

第一句是战争在林肯死前已经结束
第二句是战争在林肯死的同时结束

个人意见，仅供参考~

fannybeibei

thanks

fannybeibei