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
答
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