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    30 % of the young trees, attacked by diseases, pine trees. A. is B. are C. was D. has been 【查看更多】

     

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     30 % of the young trees, attacked by diseases, ________pine trees.

    A. is   B. are    C. was     D. has been

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     30 % of the young trees, attacked by diseases, ________pine trees.

    A．is

    B．are

    C．was

    D．has been

     

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