knock out
A: 敲击
B: 逃跑
C: 点头
D: 击倒，使无效
A: 敲击
B: 逃跑
C: 点头
D: 击倒，使无效
举一反三
- knock out（基因敲除）
- He had three of his teeth _______ out in the fight. A: knocking B: knock C: knocked D: be knocking
- knock at/on 敲knock into 撞到某人身上knock down 撞倒knock out of 把…敲出knock over 撞倒knock off 停止工作，休息1) The boxer soon knocked his opponent ________ __.2) The office stuff knocks _________ ___ at six every day.3) Try knocking __________ ___ the window and see if there is anyone indoors.4) He was so absorbed in his book that he knocked __________ _____ the car parked there.
- Suddenly he heard someone（）gently on the window. A: knock B: knocking C: knocked D: to knock
- A: Listen! There__________ someone __________ at the door.B: It must be your sister. A: is; knocking B: is; knock C: are; knocking D: are; knock