第21题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. It has helped to find some criminals. B. It has found most criminals. C. It has freed all the innocent people from prison. D. It has freed some innocent people from prison. 参考答案:D 答案解析:[听力原文]
W: In America, many prisoners are having their cases reviewed, and some have even been freed