The book was written in 1946,         the education system has witnessed great charges.
A．whenB．during which
C．since thenD．since when
D
since when引導(dǎo)定語(yǔ)從句。因?yàn)榫渲械闹^語(yǔ)has witnessed是現(xiàn)在完成時(shí),所以要用since when。when指代上文中的in 1946,表示“這本書(shū)是1946年寫(xiě)的,從那以后,教育體制發(fā)生了巨大變化”。
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