Our teacher said sound ( ) much more slowly than light?填什么及原因
问题描述:
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
答
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 theearth circles the sun