I will put the book you placed it and make a mark at the place I put it.
A. where；at which
B. at which；at which
C. where；which
D. at which；where
网友回答
A. where；at which
B. at which；at which
C. where；which
D. at which；where
解析：A
解析 前后两个从句都表示地点的含义。是定语从句还是地点状语从句，做题的关键是看有没有表示地点的名词作先行词。如果有表示地点的名词，就是定语从句；如果没有便是地点状语从句。该题中第一个从句为地点状语从句，第二个从句为定语从句，因此答案为A项。