Great attention must be paid welfare, especially in the poor area.
A. develop
B. to develop
C. to developing
D. developing
网友回答
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。