---___is your mother talking?

---___is your mother talking?
--- ___ is your mother talking?
--- my math teacher.maybe they are___my poor math marks.
A,with who,talking about B,who,talk about C,to whom,talking to
请问,此题选A,里面的with who 是什么用法,请详细说明,

talk with sb 是固定搭配.少了with不行,不符合语法要求.这个是问句,对sb提问,所以with也跟着提前了.

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