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    -Do you know the Olympics are held? -Every four years. A. how soon B. how long C. how often D. how far 【查看更多】

     

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    －Do you know ________ the Olympics are held?

    －Every four years．

    [　　]
    A．

    how soon

    B．

    how long

    C．

    how often

    D．

    how far

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