摘要：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
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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
查看习题详情和答案>>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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