—Why does he look sad? -There are so many problems ______.A. remaining to settl

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问题 —Why does he look sad?
-There are so many problems ______.

选项 A. remaining to settle
B. remained settling
C. remaining to be settled
D. remained to be settled

答案C

解析为什么他看起来很悲伤? 有很多问题沉淀在他心里了
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