The book was written in 1946, ____ the education system has witnessed great charges. A.whenB.during

题目简介

The book was written in 1946, ____ the education system has witnessed great charges. A.whenB.during

题目详情

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

答案

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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