[讨论]OG11th-59

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

选D？还是B？in which有错吗？

(B)    in which great ice sheets existed in what are now temperate areas

in which 应该没错，但是第二个in好象重复了吧。

B

OG:In which or when can be used interchangerably in this sentence.

D的时态错了，过去完成时就一招，原文里要有个过去时间点明确动作是在这个时间点前完成的。

我也刚做完51－60，这题也错了，in which应该没有错，和where可以interchange的。但是答案选B，what are now temperate areas,这里为什么用"what"？

我也不知道，就是觉得怪，能麻烦carolhide帮我翻译一下这题吗？谢谢！

in some places that are now temperate areas

-> in what are now temperate areas  (原来是冰川）

I think D is right because B is wordy with the what  clause and in D  past participal tense are used to say that the ice sheets had gone, that is now they does exist, which is accordent to the first part----Ice polished(刨蚀的)

Am I right？