题目内容

The book was written in 1946, ____ the education system has witnessed great charges.
A．whenB．during whichC．since thenD．since when
D     
在本题中用since when引导定语从句。因为句中的谓语has witnessed是现在完成时,所以要用since when。when指代上文中的in 1946,表示“这本书是1946年写的,从那以后,教育体制发生了巨大变化”。 
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