两道结构一样的语法题,求赐教.that is the school____last year.This was the

两道结构一样的语法题,求赐教.that is the school____last year.This was the place __last year
that is the school___last year.
A.which I studied.B.at which I studied.C.where I studied.D.in where I studied
This was the place ___last year.
A.which I visited.B.where I visited.C.when I visited.D.in which I visited
为什么第一题选b第二题选a

因为第一题里是study at school,而不能是study school,所以应该是at which
第二题则是visit the place,直接用which就可以了
再问： 第二题为什么不能选where I visited? 如果用where 怎么填
再答： 第二个不能用where。。where引导定语从句，在从句中是做状语的，而这个定语从句里面只缺少一个宾语，i visited the place，which指代the place