I knew that light _______ (travel) faster than sound three years ago.用所给词的正确形式添空

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I knew that light _______ (travel) faster  than  sound  three  years  ago.用所给词的正确形式添空
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I knew that light _______ (travel) faster than sound three years ago.用所给词的正确形式添空
I knew that light _______ (travel) faster than sound three years ago.
用所给词的正确形式添空

I knew that light _______ (travel) faster than sound three years ago.用所给词的正确形式添空
travels
因为是客观真理

travels

travels
陈述客观事实,要用一般现在时,不管主句是什么时态,你忘啦?

travels
单数第三人称, 而且是客观事实

travels```在从句是客观的真理和公认的事实时,谓语用一般现在时
就想说 We all know that the earth is surrounding the sun

travels我在三年前就知道声速比光速快.

travels
我在三年前就知道光速比声速快。