Although everyone tried his or her best to find solutions ,the problem remained_________
A to solve B unsolving C unsolved D solving
人气：104 ℃ 时间：2020-06-24 20:27:01
解答
C.
如果要用solve.那么就要写成 tobesolved.
所以排除AD.
这里remain是做“一直保持”、“仍然（处于某种状态）”的意思,
所以后面要接一个形容词,C符合.
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