问题补充:
My uncle is used to for the children in poor areas.
A. raise money
B. raised money
C. raising money
D. raises money
答案:
A. raise money
B. raised money
(答案→)C. raising money
D. raises money
解析:句意:我的叔叔习惯于为贫困地区的孩子们筹集资金。短语be used to sth习惯于某事;to是介词,后面接名词或者动名词作宾语,结合语境可知选C。