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    Since when you so many young trees? A. have, planted B. do, plant C. did, plant D. had planted 【查看更多】

     

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    It is a long time _______they separated, but it won’t be long ____ they meet again.

    A. since; before          B. after; when          C. since; when           D. after; before

     

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    ——Mark broke his leg when he was playing football.

    ——_____________ was that?

    A. Since when 　　　　　　　　　　　　　　　　　　　　 B.Since when ago

    C.How long 　　　　　　　　　　　　　　　　　　　　    D.How long ago

     

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    The book was written in 1946, __________ the education system has witnessed great charges.

    A. when   B. during which   C. since then   D. since when

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    It is a long time _______they separated, but it won’t be long ____ they meet again.

    A．since; before

    B．after; when

    C．since; when

    D．after; before

     

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    Since when has ____ been any of your business what I do?

    A．it

    B．that

    C．all

    D．this

     

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