来自刘全昌的问题
Aforcecanbeapushorapull.Ifyouuseaforceonacart,itwillmoveandkeepsmovingforsometimebeforeitstop.答案说keep不加s,为什么?
Aforcecanbeapushorapull.Ifyouuseaforceonacart,itwillmoveandkeepsmovingforsometimebeforeitstop.答案说keep不加s,为什么?
4回答
2020-12-28 12:00