The book was written in 1946, _____ the education system ha

时间:2021-12-03 18:31来源:未知作者:admin 点击: 次

20：The book was written in 1946, _____ the education system has witnessed great changes. A：when B：during which C：since then D： since when

20：The book was written in 1946, _____ the education system has witnessed great changes.

A：when

B：during which

C：since then

D： since when

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