◎ 题干
--- Why do you look so upset?
--- There are so many troublesome problems _________.
A.remaining to settleB.remained settled
C.remaining to be settledD.remained to be settled
◎ 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“ --- Why do you look so upset? --- There are so many troublesome problems _________.A.remaining to settleB.remained settledC.remaining to be settledD.remained …”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。