The teacher told us that light __(travel) faster than sound.

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The teacher told us that light __(travel) faster than sound.
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The teacher told us that light __(travel) faster than sound.
The teacher told us that light __(travel) faster than sound.

The teacher told us that light __(travel) faster than sound.
travels
虽然主句是过去时态,但是,光速比声速快,这是客观真理,所以用一般现在时态