问题补充：
A large sum of money has been raised the poorly-educated children in the mountainous areas.
A. in return for
B. for the benefit of
C. as for
D. in memory of
答案：
A. in return for
(答案→)B. for the benefit of
C. as for
D. in memory of
解析：词义辨析题。A. in return for 作为回报 B. for the benefit of为…利益 C. as for 至于D. in memory of 为纪念句意：募集了许多钱为了贫穷山区的孩子的利益。根据语境选B
