this is the factory where we worked last year

this is the factory where we worked last year 1.This is the factory ( ) I worked last year.A.where B.when This is the factory ()i worked last year Is this the factory ______ her mother worked last year? This factory is where I worked last year中的where的问题 this is the place___ we worked last year. This is the factory where we visited last week. This factory is ____you worked last year. 可不可以填what Is the factory --------we visited last year 定语从句This is the factory ---we worked a year ago. Is this factory_____you worked last year?A where 1．This is the best factory ____we visited last year .A.where