It was the way you talked that scared th little boy.为什么不是It

/>这是一句强调句结构,也就是说it was ...that,去掉强调句结构是the way you talked scared the boy,本身不用加介词in

若把它看成定语从句,当然这是不行的,只是假设.that前面是永远不加介词的,要用in which或者其他的

the way是定语从句中的特例只有如下结构：the way+/   the way+that  the way+in which


再问： 那可不可以是It was the way in which you talked that scared the little boy.
再答： 行的。回答你另一个问题：因为the way是特例所以此时where不等于in which，其他定语从句时一般where=in which