两道英语题 解释This is the factory-----(where/which)we visited last

1。which,这个句子缺宾语,不缺where这个地点状语,是we visited the factory,所以缺了宾语。vistit是及物动词,直接加宾语,所以用which2。where ,where是地点副词,可直接we worked where,不需要介词连接。而如果要选which的话,只能是in which,不能单是是which,因为in which = where。