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

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A. their
(答案→)B. whose
C. of them
D. with whom
解析：    
试题分析: 句意：在这个村子里，很多父母远在大城市工作的孩子们都受到了很好的照顾。由结构判断此处是定语从句，从句中的名词parents和先行词children之间是所属关系，所以用whose引导定语从句，相当于of whom the parents ，答案选B。