the two cars knock 介词 each other 用什么介词 ,

the two cars knock 介词 each other 用什么介词 , knock at,knock onWhat's the differance? knock the wood The cars were made _____ in the road for two hours because of the traffic accident. the two cars crashed in order to escape running over the dog There is some room between the two cars. 改为否定句 knock down by the people knock at the door造句 Don't____(knock)the desk knock into the tree意思 knock knock knock knock knock knock Of the two cars that the Smiths have,the Plymouth is,without any question,______.A.thecheapesttorunB.thecheapertorunC.cheaperD.morecheaper ( ) She can't the difference between the two cars A.say B.talk C.speak D.tell 应该选谁?