— 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．a(chǎn)m tryingD．tried

C

解析試題分析：句意：--你為什么在西北做志愿者的工作？--我在努力通過(guò)自己的努力改善那里孩子的生活。從第一句話：Why do you do volunteer work in the North-West?可知是現(xiàn)在正在做，用現(xiàn)在進(jìn)行時(shí)，選C。
考點(diǎn)：考查時(shí)態(tài)

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