So badly was he injured that he had to be sent to the hospital.此处为什么用badly而不是bad?

So badly was he injured that he had to be sent to the hospital.此处为什么用badly而不是bad?
So badly was he injured that he had to be sent to the hospital.此处为什么用badly而不是bad?

So badly was he injured that he had to be sent to the hospital.此处为什么用badly而不是bad?
因为这里需要副词修饰动词injured,不用形容词.
请及时采纳,多谢!