大全987~332 有关 in which 和when 求助O(∩_∩)O~

yahoochao

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

正确答案是B，我选的E。In which 与 when区别？？为什么答案中说，通常情况下in which优于when？

yahoochao

自己顶顶先~~O(∩_∩)O~期待答案

venus2elva

通常情况是介词+which结构优先。
age要用in which，time用when。

yahoochao

通常情况是介词+which结构优先。
age要用in which，time用when。

-- by 会员 venus2elva (2010/4/18 13:18:15)

多谢指教O(∩_∩)O~