单选题 —You' ve made great progress in your studies of English, haven' t you?
—Yes, but much______.
[A] remains to do [B] is remained to do
[C] remains to be done [D] is remained to be done

【正确答案】 C

【答案解析】[解析] much作为不可数名词的不定代词在句中作主语。remain是不及物动词后跟介词to。只有C项符合题目语法要求。remain后可接形容词、名词和不定式等。