The teacher told us light ___ fast than sound.(travel)

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The teacher told us light ___ fast than sound.(travel)

The teacher told us light ___ fast than sound.(travel)
The teacher told us light ___ fast than sound.(travel)

The teacher told us light ___ fast than sound.(travel)
travels

travels

答案是:travels
光走得比声音快,这是一个公理,是无需证明的,所以无论主句是什么时态,从句都得用一般现在时。

travels
一般情况下,
宾语从句语态要和主句一致.
但这个从句讲的是客观真理,
要用一般现在时