◎ 题干
If _____ unsolved, this may lead to more serious problems.

A. making
B. remained
C. left
D. taking
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“If _____ unsolved, this may lead to more serious problems. [ ]A. makingB. remained C. leftD. taking …”主要考查了你对  【过去分词】【省略句】  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。