很难的高中英语语法写理由thanks
1.However,afterayearorso__________theybecamemoreseriousabouttheirwork,theMonkeesstrartedtoplayandsingtheirownsongslikearealband.(介词+which/whom)
2.Theyproducedanewrecordin1996,________theycelebratedtheirformertimeasarealband(介词+which/whom)