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一块块玻璃和砖块正在掉下来,人们四散奔逃.Peoplewere———————while——————werefalingdown.

题目详情
一块块玻璃和砖块正在掉下来,人们四散奔逃.
People were ———————while——————were faling down .
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答案和解析
People were running away while pieces of bricks were falling down