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
答案是D,错选了B。BD纠结,不知道该如何判断。第二遍做这道题还是把握不好句意,麻烦老师讲解。