The book was written in 1946, ____ the education system has witnessed great charges.
A．whenB．during whichC．since thenD．since when
D     
在本題中用since when引導(dǎo)定語從句。因?yàn)榫渲械闹^語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“這本書是1946年寫的,從那以后,教育體制發(fā)生了巨大變化”。 
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