It is believed that a man is innocent until he is______guilty.

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问题 It is believed that a man is innocent until he is______guilty.

选项 A、to prove
B、proved
C、having been proved
D、to have proved

答案B

解析分析句子结构可知，a man和prove之间为逻辑上的动宾关系，所以应用过去分词。句中没有明显的时间状语，所以不需要用完成式。故选B。

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