【题目】— Why do you do volunteer work in the North—West？
— I_____ to improve the lives of the children there through my efforts．
A．was tryingB．have tried
C．am tryingD．tried
在线课程【答案】C
【解析】
选C，句意：--你为什么在西北做志愿者的工作？--我在努力通过自己的努力改善那里孩子的生活。从第一句话：Why do you do volunteer work in the North-West？可知是现在正在做，用现在进行时，选C。