I used to think that blindness ____,but now I know I'm wrong.

问题描述:

I used to think that blindness ____,but now I know I'm wrong.
A.can not cure
B.can not be cured
C.could not cure
D.could not be cured

答案:D.could not be cured
因为:blindness与cure之间是被动关系.主语是盲人,谓语是治疗,二者之间构成被动关系.
请及时追问,为什么?因为:blindness与cure之间是被动关系。主语是失明,谓语是治疗,二者之间构成被动关系。