The book was written in 1946,_____the education system has w

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The book was written in 1946,_____the education system has witnessed great charges.A：when B：during which C：since then D：since when 如果选C的话则要在since前面加and呢?since不是可以引导从句了吗?since在这里是介词还是连词?

since在这里是自从的意思,也就是介词如果选C,就会发现文中有两套主谓宾The book was written 和the education system has witnessed great charges,不符语法,需加连词and 不过用D做成从句就可以了,自从……when代指1946

The book was written in 1946,_____the education system has w The book was written in 1946,the education system has witnes the book was written in 1946,-----the education system has s The book was written in 1946,( )the education system has wit The book was written in 1946,__the education system has witn The book was written in 2001,___the education system has wit The book was written in 1946,_______ the education system ha ( )The book was written in1946,_____ the education system ha The book was writter in 1946,_____the educationsystem has wi 【高考】定语从句The book was written in1946,___the education system the book was written in 1946,{since when }the education syst 高三定语从句的题,1 The book was written in 1946,__the education syst