填空题 (As) secretary of transportation, he worked to help the (bankrupt railroads) in the northeastern (United States) (solved) their financial problems. A. As B. bankrupt railroads C. United States D. solved
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【正确答案】 1、D    
【答案解析】改为solve。help sb. do sth. 固定结构，意为“帮助某人做某事”。