Is this school where you used to study?是什么从句?为什么我看书上说是表语从句,而我个人认为是定语从句?

A：this is our school.B：wow.where is the（ this is our school where we learn if we're This is the school where I used to This is my school where l study and piay. is（）some German friends visited last week?A.this school where B.this school one C.this the school D.this school E.this the school that where is our school? where is the school where is the school This is the school in which I spent three years.This is the school where I spent three years.相同 Is this school ______your sister choose this year?a.the one b.that c./ d.where Is this school you used to study?空白处应填where还是at which,为什么?空白处在this 和school 之间 ( )is where the school is 填that 还是this 原因是什么? this is my school This is my school Where is BinWang Middle School where is your middle school? This is the school ___ they visited last month.A.which B.where 选哪个? This is the school where I used to study.是不是非限定性定语从句