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    When and why he came here yet. A. has not known B. are not known C. has not been known D. have not been known 【查看更多】

     

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    When and why he came here ________ yet.

    A. is not known B. are not known     C. has not known  D. have not bee

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    When and why he came here ________ yet.

    A. is not known

    B. are not known

    C. has not known

    D. have not bee

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     When and why he came here ________ yet.

    A．is not known

    B．are not known

    C．has not known

    D．have not bee

     

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    When and why he came here ________ yet．

    A．has not known                          B．are not known

    C．has not been known                  D．have not been known

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    When and why he came here ______ known yet.

    A. is not　 B. are not C. has not D. have not

     

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