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英语
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The book was written in 1946,since when the education system has witnessed g
为何不选during which
人气：392 ℃ 时间：2020-04-24 10:49:16
解答
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
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the book was written in 1946,-----the education system has saw great changes.
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高手帮忙：That was written in 1946, since______the education system has undergone great changes.
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