一个史上很难解释的英语单选题.63、The book was written in 1946,_____the education system has witnessed great changes.A:when B:during which C:since then D:since when此题答案是D.我想知道,since在此是连词还是介词?

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一个史上很难解释的英语单选题.63、The book was written in 1946,_____the education system has witnessed great changes.A:when B:during which C:since then D:since when此题答案是D.我想知道,since在此是连词还是介词?

一个史上很难解释的英语单选题.63、The book was written in 1946,_____the education system has witnessed great changes.A:when B:during which C:since then D:since when此题答案是D.我想知道,since在此是连词还是介词?
一个史上很难解释的英语单选题.
63、The book was written in 1946,_____the education system has witnessed great changes.
A:when B:during which C:since then D:since when
此题答案是D.我想知道,since在此是连词还是介词?
因为
第一:如果是连词,连词后怎么又出现了连词when?
第二:如果是介词,那么when引导的应该是宾语从句吧?
我在此迷惑了,
我最希望知道的是,since如果是介词,那么when是什么词性?(如果代替的是1946,那when就是代词了;如果代替的是in 1946,那么when就是副词了。)
我觉得应该是代词,但我从来没听说when是关系代词的说法。如果我理解错了,别的也解释不通

一个史上很难解释的英语单选题.63、The book was written in 1946,_____the education system has witnessed great changes.A:when B:during which C:since then D:since when此题答案是D.我想知道,since在此是连词还是介词?
when 引导的是定语从句.把它还原的话就变成了the education system has witnessed great changes since 1946.
解题关键在于“has”.这种完成时一般都由since开头.如果没有“has”,那么A更好
如果没有has,那么when就是代替的是in 1946,如果有的话,就是代替1946.其实不用拘泥于when到底是什么词性,记住定语从句的几个特点就行了.

since作为介词,when引导的是时间定语从句
西西…^^

since 在这里是介词,引导的是时间状语从句。并不是宾语从句。

when 引导的是定语从句。把它还原的话就变成了the education system has witnessed great changes since 1946.
解题关键在于“has”。这种完成时一般都由since开头。如果没有“has”,那么A更好
如果没有has,那么when就是代替的是in 1946,如果有的话,就是代替1946.其实不用拘泥于when到底是什么词性...

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when 引导的是定语从句。把它还原的话就变成了the education system has witnessed great changes since 1946.
解题关键在于“has”。这种完成时一般都由since开头。如果没有“has”,那么A更好
如果没有has,那么when就是代替的是in 1946,如果有的话,就是代替1946.其实不用拘泥于when到底是什么词性,记住定语从句的几个特点就行了。

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介词。when引导宾语从句

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