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    31．It was in the Ming Dynasty the Great Wall was rebuilt to keep out northern tribes threatened the Chinese heartland. A．that; that B．that; where C．when; that D．when; when 【查看更多】

     

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    It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

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

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    It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

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

    查看答案和解析>>

    It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

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

    查看答案和解析>>

    It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

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

    查看答案和解析>>


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