The book was written in 1946,since when the education system has witnessed g

问题描述:

The book was written in 1946,since when the education system has witnessed g
为何不选during which

我觉得是时态的问题
Since(表示时间)从…以来; 自从…之后
during(表示时间)在某情况的一段时间
个人看法