I'm sorry for____your cup on the desk.A knocking over B knocking off C knocking down请问选哪一个?

Aknock over 碰翻; 打倒非正〉将…击打掉,碰撞掉She knocked the vase off by accident.她不小心把花瓶打掉了.knock down 〈非正〉击倒,撞倒He knocked his opponent down with one blow in the competition.比赛中...