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    No one knows exactly this important discovery was made. A. that B. that how C. what D. when 【查看更多】

     

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    No one knows exactly ______ this important discovery was made.

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

     

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    No one knows exactly ______ this important discovery was made.

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

    查看答案和解析>>

    No one knows exactly ______ this important discovery was made.

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

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