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The Great Wall of China was built to keep out invaders in Qin dynasty．(对画线部分提问)
________ ________ the Great Wall of China built in Qin dynasty?
答案：Why,was
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题目内容
按要求改写句子
The Great Wall of China was built to keep out invaders in Qin dynasty．(对画线部分提问)
________ ________ the Great Wall of China built in Qin dynasty?