The boy mother was ill could not come to school.A. whoB. whoseC. whichD. whom

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A. who
(答案→)B. whose
C. which
D. whom
解析：考查定语从句。本定语从句的先行词是the boy, 定语从句中mother前面缺少定语修饰，whose在定语从句中，指代先行词在句中做名词的定语。句意：那个妈妈在生病的男孩不能来学校了。故B正确。