◎ 题干
— Why do you do volunteer work in the North-West?
— I_______ to improve the lives of the children there through my efforts.
A.was trying B.have tried C.am trying D.tried
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“ — 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 triedC.am trying…”主要考查了你对  【现在进行时】【现在进行时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。