大全987-332

1.       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（B）

(E) when great ice sheets existed in areas now that are temperate

请问 D 时态 有甚么错?  盼望解答

个人觉得单从时太上看D很难的.但D中的in current temperate areas.有问题.原文是说在现在那些(气候)温和的地方.而不是D说的在current temperate  areas.

首先age一定要跟in which，是固定搭配，记住吧。

其次，用过去完成时不清楚到底是在什么时间之前呢？在没有明确的时间状语的情况下，觉得用过去时没有错就不要用过去完成时。

不是，OG说这里in which与when都可。

我记得以前有道题，原题记不清楚了，大概就是the building had been destroyed before rebuilded.

那么这里，在那个地区成为tamperate areas 之前，那个冰川存在，所以用过去完成没什么不对呀

请拍砖？

正如你所说，the building had been destroyed before rebuilded.这里用完成时态原因在于有rebuilded这个词，而题目中没有。

有点意思，就是说没有明确的指示词的时候就不应该乱用~过去完成不随便用~

谢谢~我要好好修炼！！

1873不是一个时间节点吗？那个人在1873年一拍脑袋，觉的之前的冰川就在温带，这里用过完有何不可？

选B给我感觉1873年是冰河期。。。。。