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

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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
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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
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?

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
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