问题补充：
The children parents are away working in cities are looked after well.
A. which
B. whose
C. that
D. who
答案：
A. which
(答案→)B. whose
C. that
D. who
解析：考查定语从句。本定语从句的先行词是the children，定语从句中名词parents前面缺少定语修饰，选项中的whose通常在定语从句中做定语。句意：那些父母外出在城里工作的孩子们被照顾的很好。故B正确。
