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    4．The book was written in 1946. the education system has witnessed great changes. A．when B．during which C．since then D．since when 解析:句意:这本书写于1946年.从那时起教育体制发生了巨大变化.因为从句中时态为现在完成时.故选since when来引导这一定语从句.A.B两项引导的从句应使用过去某种时态,C项只是充当后面从句中的时间状语.而不能充当引导词来引导该从句.故排除. 答案:D 【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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