He said that light____(ravel) much faster than sound.

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He said that light____(ravel) much faster than sound.
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He said that light____(ravel) much faster than sound.
He said that light____(ravel) much faster than sound.

He said that light____(ravel) much faster than sound.
travels
句子意思:他说光比声音的传播速度要快多了.
因为从句所讲的是事实,所以不管前面用什么时态,后面都用现在时

travels
定理性的东西 没有时态

travels

He said that light travels much faster than sound.
光的传播速度比声音的要快,这是客观真理,必须用一般现在史。
希望能帮到你!