---Hi, Lydia. Are you going to the concert on Friday?---I’d like to. But there are so many problems_______.A.remaining to be settledB.remained settlingC.remaining to settleD.remained to be settled
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A解析考查非谓语动词。Remain无被动，所以用remaining；而问题是要被解决，应用不定式的被动形式，所以选C。