问题描述：
It is four months since I last saw Keats ______.
a.at Mrt Smith’s ,the book seller c.at my aunt’s,a book seller
b.at my aunt’s,Mrs Palmer’s d.at Mrs Palmer’s,the book seller’s
请高手给个确切的答案,讲下其中的语法知识,
a.at Mrt Smith’s ,the book seller c.at my aunt’s,a book seller
b.at my aunt’s,Mrs Palmer’s d.at Mrs Palmer’s,the book seller’s
请高手给个确切的答案,讲下其中的语法知识,
问题解答：
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