——is known to us all that sound travels more slowly than light ,应当是as 还是it 还是that 亚
问题描述：
——is known to us all that sound travels more slowly than light ,应当是as 还是it 还是that 亚
这个我觉得应当是as 但是答案是it
答
As
As is knomn to us 是固定结构.