the book was written in 1946,{since when }the education system has saw great changes.逗号后面引导一个非限制性定语从句,以介词since开始,这不是介词+which的形式吗?为什么用when?选项since then为什么不对?

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thebookwaswrittenin1946,{sincewhen}theeducationsystemhassawgreatchanges.逗号后面引导一个非限制性定语从句,以介词since开始,

the book was written in 1946,{since when }the education system has saw great changes.逗号后面引导一个非限制性定语从句,以介词since开始,这不是介词+which的形式吗?为什么用when?选项since then为什么不对?
the book was written in 1946,{since when }the education system has saw great changes.
逗号后面引导一个非限制性定语从句,以介词since开始,这不是介词+which的形式吗?为什么用when?选项since then为什么不对?

the book was written in 1946,{since when }the education system has saw great changes.逗号后面引导一个非限制性定语从句,以介词since开始,这不是介词+which的形式吗?为什么用when?选项since then为什么不对?
since then是副词短语,不能引导一个定语从句.
“The book was written in 1946”和“the education system has saw great changes”都是完整的句子,中间肯定是用连词连接的,副词没有这个功能.
定语从句有介词,一般我们都是用介词+which的,但是这个句子比较特殊,用一般的思路不好理解.我觉得可以这样想：
which在定语从句中是要充当成分的,像是主语或宾语.但是看后面的句子“the education system has saw great changes”,主谓宾是完整的.缺状语,那就用when,不用which了.

这个问题，我想后面是非限制性定语从句没错，但是后面的句子修饰的是1946这个时间，翻译为自从1946开始，泳衣修饰时间，当然用when，至于then 不能用的问题，我想英语里都是最佳答案，从语法角度，then没错，但是用了就不再是非限制性定语从句，因而，用when是最佳答案。嘿嘿，欢迎采纳...

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这个问题，我想后面是非限制性定语从句没错，但是后面的句子修饰的是1946这个时间，翻译为自从1946开始，泳衣修饰时间，当然用when，至于then 不能用的问题，我想英语里都是最佳答案，从语法角度，then没错，但是用了就不再是非限制性定语从句，因而，用when是最佳答案。嘿嘿，欢迎采纳

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因为这里的since when翻译成从那时候开始when是用来修饰the book was written in 1946

by who was the book written Who do you think _ A did the book write B was the book written C was the book written byA did the book writeB was the book writtenC was the book written byD the book was written by written by 和written的区别Who was the book written 后面为什么不能加by? A book was written on the subject.He has written a book on this subject.时态? who was the book written by、这个句子对吗 Who was the book---?A.wroteB.writtenC.written The book was written ( )LuXun (介词填空） The book was written by him 变为Who____________________ who was the book weitten by?和whom was the book written by?有什么区别? Whom was the book---?Who was the book---?A.wroteB.writtenC.written by选B对吗? Who was the book( A.write B.wrote C.written D.written by The book ____ (write) by Bill Gates in 2002.是 is written 还是 was written .The book _____ by Luxun is very famous.( write ) 为什么填written而不是was written Many students enjoy the book Harry Potter ( )by JK Rowling.A written B was written C wrote D was writing I borrowed a book()by J.K.Rowling from the library last week.A written B was written The book was written in 1946,( )the education system has witnessed great changes. Here is a note book,in which _______ the names of the visitors.A.write B.written C.were written D.was written the book is written in german 与 the book was written in german 有什么区别吗?翻译成中文又是怎么样的?