Some social workers after the people in need while others out food to the local people.

问题补充：

Some social workers after the people in need while others out food to the local people.

A. looked, gave

B. were looking, gave

C. were looking, were giving

D. looked, were giving

答案：

A. looked, gave

B. were looking, gave

(答案→)C. were looking, were giving

D. looked, were giving

解析：根据语境可知此句的含义是一些社会工作者照顾有需要的人，而其他人提供食物给当地人民群众。此题重点考查的是while引导的状语从句表示当…的时候。其强调的是两个动作同时进行，并且经常用进行时态，故选C。