---Alltheskatersonthelake______thattheicemightbetoothin.---Yes,youse

发布时间：2020-08-06 20:39:54

---All the skaters on the lake ______ that the ice might be too thin.---Yes, you see, spring is ing and it's getting warmer.A.have been warnedB.have warnedC.are warnedD.warned

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