since then &since whenThe book was written in 1946,_______ the education system has witnessed great changes.A.since when B.since then 为什么选A不选B?

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sincethen&sincewhenThebookwaswrittenin1946,_______theeducationsystemhaswitnessedgreatchanges.A.since

since then &since whenThe book was written in 1946,_______ the education system has witnessed great changes.A.since when B.since then 为什么选A不选B?
since then &since when
The book was written in 1946,_______ the education system has witnessed great changes.
A.since when
B.since then
为什么选A不选B?

since then &since whenThe book was written in 1946,_______ the education system has witnessed great changes.A.since when B.since then 为什么选A不选B?
since when 作为定语从句修饰1946.
如果是1946年发生的事,可以直接使用when
但句中给的事情是一直持续到现在的事情,故用since when

因为这是从句啊.如果since前是句号就是since then

如果选B,
那么一般都是在句首,而且有逗号,"从那时起"
而这里选A,翻译成从(since)后面是从句when引出时间.
如果不用when引出,since+时间点前面就要用完成时态,就是另外一种意思了

翻译：ever since then ever since then since then可以说成 since that time But then /Before then / Since then/ Until since since then 是啥意思? ----------------you----------------(know)him since then 从那以后是from then还是since then? since then 与since ever有什么区别? since then 和since that有什么区别? since then 与since ever有什么区别? Since that和 since then是一样的吗?为什么? since then后接什么时态 since then加一个一般疑问句吗 Since then,only you in my inadverently broke my heart,since then翻译 ten years _____(pass) since then. she has lost touch since then 翻译