He always believes that the world won't achieve the ultimate peace until all thieves are sent to ______prison
【正确答案】 A
【答案解析】解析：句意：他深信如果不把小偷都关进牢里世界就无法实现最终的安宁。此题考查固定搭配，send sb．to prison把某人送进监狱，prison前不加冠词，故选A。