This portion of the story is punctuated for flash-forwards to a time 40 years in the future, showing the relationship between parents and children to be dramatically changed.
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【正确答案】 1、正确答案：介词误用，应把for改为with。    
【答案解析】解析：punctuate with表示“用……打断，交织”，此处的意思是“故事的这一部分总是穿插40年后的一些场景”。