单选题 Mrs. Smith, ＿＿＿＿＿＿＿＿ , has been looking after Mary since her motherˊs death. 的答案

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题目内容：
Mrs. Smith, ＿＿＿＿＿＿＿＿ , has been looking after Mary since her motherˊs death.
题目选项

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