there are so many problems remaining to be settled 这个句子对吗?有没

—Why do you look sad?
—There are so many problems _____.
A. remaining to settle B. remained settling
C. remaining to be settled D. remained to be settled
【解题关键】 解答该题的关键在于要准确把握There be句子结构及系动词remain的用法.
【答案解析】remain 在There be 结构中用作后置定语,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.答案为C.