—Why do you look sad?—There are so many problems .A. remaining to settleB. remained settli

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A. remaining to settle
B. remained settling
(答案→)C. remaining to be settled
D. remained to be settled
解析：由于remain是不及物动词，故应用现在分词remaining，相当于定语从句that remains；动词settle置于remain之后，应用动词不定式的被动结构来表示动作还未完成。