核心问题
No, that was the doctor I was speaking to. 从句意上看,这似乎是个强调句。但是,从结构上看,这又不是个强调句,因为主语并不是 it。
词典解答
事实上,在强调句中也可以用 it 以外的代词(he, that, those 等)来作主句的主语(多用在口语体中):
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He was a real genius that invented this. (CGEL) 发明这个东西的正是他这个真正的天才。
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Those are my feet that you're stepping on. 你踩的正是我的脚。