10.(25013-!-item-!-188;#058&001959)
The rise of the Incan empire rested not only on the Incas' military might and the ability of their rulers but also they imposed a highly organized economic and political system on many different ethnic groups and permitting them to retain many of their customs and often their own leaders.
(A) they imposed a highly organized economic and political system on many different ethnic groups and permitting them
(B) on their imposition of a highly organized economic and political system on many different ethnic groups, who were permitted
(C) because of their imposition of a highly organized economic and political system on many different ethnic groups, who they permitted
(D) on their imposing of a highly organized economic and political system on many different ethnic groups and they permitted them
(E) imposing a highly organized economic and political system on many different ethnic groups, permitting them
答案是B，看到选项直接排除剩BD，看名词平行所以imposition>imposing，D选项and they permitted them无平行对应，这些都没什么问题。
我的疑问在于，B选项后面who指代ethnic groups，后面的their也是指代groups，那和前面明显指代Incas'的their不是冲突了吗？
-- by 会员 terry9115 (2011/8/2 0:36:00)