I don't think looking after children is just work.A.womanB.woman's.C.womenD.women's

步骤 1：理解句子结构
句子的结构是 "I don't think + that从句"，其中 "that" 可以省略。从句的主语是 "looking after children"，谓语是 "is"，表语是 "just _____ work"。
步骤 2：分析选项
A. woman - 单数名词，表示女性。
B. woman's - 单数名词所有格，表示女性的。
C. women - 复数名词，表示女性。
D. women's - 复数名词所有格，表示女性的。
步骤 3：选择正确答案
根据句子意思，"looking after children" 是复数概念，因此需要复数名词所有格来修饰 "work"。所以正确答案是 "women's"。