The book was written in 1946, ____ the education system has witnessed great changes.
A．whenB．during whichC．since thenD．since when
D
考查定語從句。since when以為“從那時起”，when時間副詞，這里指代時間 1946，相當(dāng)于since when的意思就是since the year 1946。句意：自從1946年起，教育體系經(jīng)歷了巨大變革。
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