请教885section14-13

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

the key is b.

那么e的不足在什么地方呢？是不是因为now 不应放在that的前面？

It is impossible that great ice sheets still exist in areas now that are...

Be careful to the position of "now"...

E的问题：

1. age 与 in which 搭配，（XDF的理论，暂时没有例外，姑且记着是固定搭配）；

2. now 的位置有修饰歧义：a. 修饰existed， b.修饰that are temperate；

3. sth. that + be + adj. 结构永远错，不简洁，直接用 adj. + sth.

个人感觉

"areas that are now temperate" 指现在是温带的那些地区，（以前也许是寒带或是热带）

areas now that are temperate 指现在的地区，该地区是温带