—You’ve made great progress in your English study, haven’t you?—Yes, but much A.remains to doB.is remained to doC.remains to be doneD.is remained to be done
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C解析考查非谓语动词。句意“你的英语学习已经有了很大的进步,不是吗?”“是的,但是还有很多事情要做。”remain to be done是固定句型,意为“......有待被做”。much和do是动宾关系,应该用被动形式。故选C。