The book was written in 1946,         the education system has witnessed great c

The book was written in 1946,         the education system has witnessed great c

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

答案
D
解析
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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