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    28．It never occurred to humans until the mid-1990s some animals can be cloned． A．where B．that C．when D．what 【查看更多】

     

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    It never occurred to humans until the mid-1990s _____ some animals can be cloned．

    A．where         B．that          C．when            D．what

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    It never occurred to humans until the mid-1990s ________ some animals can be cloned．

    [　　]
    A．

    where

    B．

    when

    C．

    that

    D．

    what

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     It never occurred to humans until the mid­1990s ________ some animals can be cloned.

    A．where             B．that                    C．which          D．what

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     It never _____  humans until the mid­1990s that some animals can be cloned.

    A．occur

    B．is occurred

    C．occurred to

    D．occurred

     

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