gmat语法里，who 可以用来指代groups?不是只能指人的吗？

熊的传人

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. B

(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
如题，B选项中，who refers to groups ?~

DUKB24

since it appears in the correct answer choices

what you can do is to remember this rare exception

kiwifoodtown

ethnic groups 就是一群人。

熊的传人

since it appears in the correct answer choices

what you can do is to remember this rare exception

-- by 会员 DUKB24 (2012/10/24 10:39:57)

。。。好吧~~