问题：
试题 题型：未知 难度等级：
(2013·河北普通高中高三质量监测)Sitting at the corner of the meeting room
(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
试题 题型：未知 难度等级：
(2013·河北普通高中高三质量监测)Sitting at the corner of the meeting room
(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 ________.
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参考答案：