问题描述：
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
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
问题解答：
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