Particular attention must be paid welfare especially in the poor area.A. developB. to de

问题补充：

Particular attention must be paid welfare, 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：句意：应该特别重视发展人民的福祉，尤其是在贫困地区。句中用到了pay attention to doing sth重视做某事，的固定句型，本句中运用给了被动形式，故选C