(2013·河北普通高中高三质量监测)Sitting at the corner of the meeting room, he looked sad because there

(2013·河北普通高中高三质量监测)Sitting at the corner of the meeting room, he looked sad because there were so many problems .
A. remaining to settle
B. remained settling
C. remaining to be settled
D. remained to be settled

A. remaining to settleB. remained settling(答案→)C. remaining to be settledD. remained to be settled解析：C　考查非谓语动词。句意：坐在会议室的角落里，他看起来很伤心，因为仍然有那么多问题需要解决。remain在there be结构中作后置定语，由于remain是不及物动词，故应用现在分词remaining；且settle与problems之间构成动宾关系，故用不定式的被动形式。remain后接不定式表示动作还未完成。

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