This is the school which I taught last year.请问which前可以加介词at吗

This is the school which I taught last year.请问which前可以加介词at吗 Is this school ____we visited last year?A.which B.in which C This is the house in which we lived last year This is the room in ___ I lived last year.A.Which B.That C.W This is the hotel which I lived in last year 的同义句 1.this is the book -------- i wrote last year 为什么不填WHICH,而要用 this is the house in which we lived last year.这里为什么用which啊?答 This is the hotel at which we're staying.which可以省掉吗? this school is which you visit last year 为什么不是表语从句? Come and visit our school at the end of this year,by which t a school was established last year in our town.which is the this is the thing which she is looking at这里at能不能介词提前?