Our teacher said sound ( ) much more slowly than light?填什么及原因A traveled B wad traveling C has traveled D travels

Our teacher said sound ( ) much more slowly than light?填什么及原因A traveled B wad traveling C has traveled D travels
Our teacher said sound ( ) much more slowly than light?填什么及原因
A traveled B wad traveling C has traveled D travels

Our teacher said sound ( ) much more slowly than light?填什么及原因A traveled B wad traveling C has traveled D travels
D 表示一般常理 道理 知识的 时候动词 都用 一般现在时 比如地球绕着太阳转 the earth circles the sun