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the book was written in 1946,-----the education system has saw great changes.问什么空不能说since which 而 只能是 since when.准确答案 谢谢

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the book was written in 1946,-----the education system has saw great changes.
问什么空不能说since which 而 只能是 since when.
准确答案 谢谢
▼优质解答
答案和解析
which指代sth.when指代time,这里想表达的意思是自从1946年以来,所以指的是时间只能用when,clear?希望你能给我分,新手上路呀,请多多支持!