(1分20秒-1分50秒) And as you look at what went on, the problem wasn't that there was a system that didn't work well enough, the problem was that __________________.
选项:
A:We didn’t have a control system
B:We didn’t have a surveillance system
C:We didn’t have a response system
D:We didn't have a system at all.
发布时间:2024-06-15 15:26:46