The physical teacher told us light( )faster than sound

问题描述:

The physical teacher told us light( )faster than sound
A give B travels C is travsling D was traveling

b
考察的是一般现在时的一种特殊用法:当句子描述真理时用一般现在时
这里“光比声音传播快”是真理
所以用一般现在时