The book was written in 1946,the education system has witnessed great charges.The book was written in 1946, the education system has witnessed great charges.A．when B．during whichC．since then D．since when

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Thebookwaswrittenin1946,theeducationsystemhaswitnessedgreatcharges.Thebookwaswrittenin1946,theeducat

The book was written in 1946,the education system has witnessed great charges.The book was written in 1946, the education system has witnessed great charges.A．when B．during whichC．since then D．since when
The book was written in 1946,the education system has witnessed great charges.
The book was written in 1946,         the education system has witnessed great charges.
A．when               B．during which
C．since then           D．since when

The book was written in 1946,the education system has witnessed great charges.The book was written in 1946, the education system has witnessed great charges.A．when B．during whichC．since then D．since when
D
since when = since1946,1946年是先行词,when是关系副词,
而since when用作副词短语,是从句中的时间状语.

这个句子可以这么拆分
the book was written in1946.
the education system has witnessed great charges since 1946这部分不缺成分,如果合并以后,就做1946的状语,因此用when,since 提前,1946 是先行词,合并,就得到你的原句

这么复杂的语法分析要是你看不懂的话,还有一个偏方：
后面是完成时的,你用since when
后面是过去式的,你用during when

选A。非限制性定语从句。

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根据高中所学的定语从句的知识，本题没有答案。
A和B when,during which不行，从句时态不对；
since
conj. 因为；由于；既然；自…以来；自…以后
prep. 自…以来；自…以后
如果是连词，后面的句子不合适，因为有when从句；
如果是介词，介词后的when就属于代词，但关系代词中又没有when
所以，个人认为，本来就是个错句，尽管这是2007年山东高考题。
应该是since which time, 或者since which year
这有一个解释
【试题解析】按照句意，此处应选C项，但它却不能引导一个定语从句，所以答案为D项。
还有别的一些例子可以参考：
http://www.njyyjy.com/blog/html/69/7269-3757.html

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