is this factory that we visited last week,为什么在that 前加the one

is this factory that we visited last week,为什么在that 前加the one The factory is the one （that） we visited last week为什么一定要用tha Is this factory the one you visited last week.为什么THAT不可以替换 T Is this factory (the one)I visited last week . This factory is ______ the one we visited last week.正确答案是the This is the factory where we visited last week. Is this the factory _____ we visited last week? Is this factory( )you visited last week?A.that B.where C.the this Is the very factory ____we visited last week A.that B.w Is this the factory ____you visited last week? A that B wher is this factory----you visited last year?A .the one B.that C This is the factory (that/which)we visited yesterday.