英语.最好高人进.That was written in 1946,since______the education s

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英语.最好高人进.
That was written in 1946,since______the education system has undergone great changes.
A then B when C there D which
选B.可我不明白为什么不选D呢,定语从句的先行词不是只能是个名词么?难道when 可以指代IN 1946么,不可能的啊,先行词不是前一个句子就应该是"1946"这个年份嘛,要指年份也应该用which啊.急.
拜托别拿别人的答案发过来,我都看过了已经.看的懂还在这里问么.请尊重别人,尊重自己.

先分析后面的句子成分全都齐全了.而A和C都不可引导定语从句,所以可排除.剩下BD.而一般认知会选D.但是因为后面的主要成分不却,而"which"显然在此也不指代前面的整一句话,所以不选D.选"when"指代前边的"in 1946",而不要逗号变成并列句改动如下:
That was written in 1946 (and since 1946 )the education system has undergone great changes.
这是别人的回答,其实我也没看懂

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