B.proved C.having been proved 这俩的区别 为什么选BIt's believed that a man is innocent until___guilty.

B.proved C.having been proved 这俩的区别 为什么选BIt's believed that a man is innocent until___guilty.
B.proved C.having been proved 这俩的区别 为什么选B
It's believed that a man is innocent until___guilty.

B.proved C.having been proved 这俩的区别 为什么选BIt's believed that a man is innocent until___guilty.
其实这句话的until后面的句子是省略了主语he(the man)和系动词is,所以用proved,is proved被证实.你见过is having been proved的用法吗?我都不知道如何解释它的.