IfI_________theywereonsaleonline,Iwouldn'thaveboughtthetravelingbagsinthisstore.(2016-12) A: know B: knew C: hadknown D: haveknown

IfI____wherehelived,I____anotetohim. A: knew;wouldsend B: hadknown;wouldhavesent C: know;wouldsend D: knew;wouldhavesent