Unluckily，whenIarrived，myfriend____，soweonlyhadtimeforafewwords．（）A.wasjustleavingB.hadjustleftC.hasjustleftD.justleft

　　Unluckily，when I arrived，my friend ____，so we only had time for a few words．（）

　　A.was just leaving

　　B.had just left

　　C.has just left

　　D.just left