◎ 题干
It is not necessary for you to be ___________ about other's business.
[     ]
A. concern
B. concern yourself
C. concerning
D. concerned
◎ 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“It is not necessary for you to be ___________ about other's business. [ ]A. concernB. concern yourselfC. concerningD. concerned…”主要考查了你对  【过去分词】  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。