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

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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