Another 20% worked well, but the remaining 60% should have been

Another 20% worked well, but the remaining 60% should have been 【scrapped】.
A、scratched
B、renovated
C、stimulated
D、introduced
【正确答案】：B
【题目解析】：scrap本意为“废弃，拆毁”，在这里意为“修复，革新”；scratch刮去痕迹；renovate更新，修复；stimulate刺激，鼓舞；introduce介绍，引入；故选B。