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题目
题型:不详难度:来源:
The book was written in 1946, ____ the education system has witnessed great charges.
A.whenB.during whichC.since thenD.since when

答案
D     
解析
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”。 
核心考点
试题【The book was written in 1946, ____ the education system has witnessed great char】;主要考察你对句法等知识点的理解。[详细]
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