If you someone,you should say “I’m sorry”.A.knock at B.knock over C.knock into D.knock out

题目

If you someone,you should say “I’m sorry”.A.knock at B.knock over C.knock into D.knock out
的答案是什么 为什么

答案

knock into 撞上
knock at 敲（门、窗等）
knock over 打翻,撞到
knock out 击倒 也就是全集中的K.O.