问题补充:
Great attention must be paidwelfare, especially in the poor area.
A. develop
B. to develop
C. to developing
D. developing
答案:
A. develop
B. to develop
(答案→)C. to developing
D. developing
解析:考查句子结构。本题中含有固定搭配pay attention to sth/doing sth注意sth/做某事;其中的to是介词,后面要接动名词或者名词。本题是这一结构的被动语态的形式;句意:一定要注意人们的福利,尤其是贫穷地区人们的福利。故C正确。