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The estimated income for my（ ）business next year is 500,000.
A、Mother's-in-law
B、Mother-in-law's
C、Mother in law's
D、Mother's in law
【正确答案】：B
【题目解析】：Mother-in-law，岳母，复数形式是Mothers-in-law。句中强调岳母的生意，要用名词所有格形式，即名词后加 's来表示所有关系。