◎ 题干
I feel upset, for there are so many, troublesome problems _____ .  
[      ]
A. remaining to settle    
B. remained to settle
C. remaining to be settled              
D. remained to be settled
◎ 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“I feel upset, for there are so many, troublesome problems _____ . [ ]A. remaining to settleB. remained to settleC. remaining to be settledD. remained to be …”主要考查了你对  【不定式的被动式】【现在进行时】  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。