4．The book was written in 1946. the education system has witn閳ワ腹鈧拷【查看更多】

 

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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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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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(  )24. 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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