knocked at my door 和 knocked my door 区别?

knocked at my door 和 knocked my door 区别? I () my brother when someone knocked at the door I knocked at the door as if i knocked at my own.的时态 是knocked at the door还是knocked on the door My father was watching me __when someone knocked at the door When he knocked at the door,my aunt was ________ （cook） dinn someone knocked( )the door while i( )my housework What___you___when someone knocked at the door? Somebody knocked at the door while I___ knocked at door .连音怎么读?） Someone knocked on my door just now.But he left ------ I cou I was cleaning my bedroom while someone knocked on the door改