【单选题】听力原文:W: In America, many prisoners are having their cases reviewed, and some have even been freed through DNA testing. M: Then, how about the ones whose death sentence have already been carried out? Q...
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.