I will put the book---------you placed it andmake a mark at the place----I pwhere ,at which为什么?will put the book---------you placed it andmake a mark at the place----I put it.

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I will put the book---------you placed it andmake a mark at the place----I p
where ,at which为什么?
will put the book---------you placed it andmake a mark at the place----I put it.

这句的意思是“我会把书放在你放这本书的地方并在那做一个记号”.
where you placed it 构成了一个由 where 引导的地点状语从句,修饰主句里面的“put” 说明放书的地点.
at which 是一个由关系代词引导的定语从句,其先行词是place.这个定语从句本来可以由关系副词where来引导,但有时定语从句里面的动词如果带了介词的话通常要用介词+关系代词方式来代替关系副词,即 at + which 代替where.

将会把书放在它andmake ---------你在这个地方的标志----我把它。

后面的at which 也可以换成where