◎ 题干
If ____ unsolved, the problem of food safety may lead to more serious results.
A.makingB.remainedC.leftD.taking
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“If ____ unsolved, the problem of food safety may lead to more serious results.A.makingB.remainedC.leftD.taking…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【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。