18、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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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
科目：高中英语 来源： 题型：
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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