Many children, parents are away working in big cities, are taken good care of in the vill

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A. their
B. of them
(答案→)C. whose
D. with whom
解析：考查定语从句。本题定语从句的先行词是many children,在定语从句中，whose指代先行词作为名词parents定语。句意：很多父母在大城市里工作的孩子在村子里被照顾得很好。AB项不是定语从句，故C正确。