I knew that light______(travel)faster than sound three years ago.

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I knew that light______(travel)faster than sound three years ago.
I knew that light______(travel)faster than sound three years ago.

I knew that light______(travel)faster than sound three years ago.
travels
光比声音传播得快,是一般事实.虽然句子时态是过去时,但这里填一般时即可.light,光,是单三,所以是travels.
I knew that light  _travels_ faster than sound three years ago. 我三年前就知道光的传播速度比声音快(这件事)了.

I knew that light travels faster than sound three years ago.
Travel 要加 S 因为light 是第三人称单数。
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travels客观事实。一般现在时

你好！

travels
客观真理用一般现在时

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填travels 因为这是事实，客观真理性的，所以要用travels
I kenw that light travels faster than sound three years ago.
翻译：
三年前我就知道光比声音速度快。

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