问题描述：
一道SAT语法, 改句子
3. Perhaps （those of us being concerned） should encourage debate about what other levels of government can do to solve the problems of waste disposal.
A. those of us being concerned
B. those of us who are concerned
C. those concerned ones of us
D. we, being among those who are concerned,
E. we who are those being concerned
我选C,答案选B,为什么C不对?解析上说those of us不能分开的,为什么?谢谢!
3. Perhaps （those of us being concerned） should encourage debate about what other levels of government can do to solve the problems of waste disposal.
A. those of us being concerned
B. those of us who are concerned
C. those concerned ones of us
D. we, being among those who are concerned,
E. we who are those being concerned
我选C,答案选B,为什么C不对?解析上说those of us不能分开的,为什么?谢谢!
问题解答：
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