it has proved or it has been proved

题目

it has proved or it has been proved
Which one is correct?
(1) or (2)
1)
Preventative medicine has proved to be the most effective way of reducing the incidence of fatal childhood diseases.
2)
Preventative medicine has been proved to be the most effective way of reducing the incidence of fatal childhood diseases.

答案

选2 被动语态,表示“被证明、被证实” 不过,用过去分词proven的表达会更多一些：has been proven,表示“被证明、被证实”的状态:Preventative medicine has been proven to be the most effective way of reducing t...