求教两个英语句子I'm always busy with my work,so occasions are quite

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求教两个英语句子
I'm always busy with my work,so occasions are quite rare____ I can spend the whole day with my kids
A.in which B when 为什么?
The book was written in 1946,____the education system has witnessed great changes
A.when B,during which C.since then D,since when E,since which 为什么

1 B when 这是分隔式定语从句先行词与定语从句之间插入了谓语
2.句意：该书写于1946年,从那以后教育制度已经历了巨大变化.根据从句中的现在完成时态和句意,我们可排除AB两项；短语since then 意为“从那以后”,但不能引导一个定语从句,
因此也排除了C项；
选项E 我认为也可以不过 which只能代替1946 不能代替in 1946
故此处应选D since when
相当于and since then
这时的 when起代词作用代替 in 1946 作介词 since 的宾语
也就是 since when 引导非限制性定语从句并在从句中作状语

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