【正确答案】 D

【答案解析】解析：【改正】Local governments assume high—speed railway can change the existing regional economic patterns of cities，bring new economic benefits，and facilitate the rapid development of the new city areas． 本句为缺少连接词或标点符号的长句，所以是流水句错误。句中，local governments为主语，assume为谓语，后接省略了that的宾语从句。从句中high—speed railway为主语，后面的can change……，bring……和facilitate……为并列的谓语，需在最后一个谓语（facilitate……）前加“逗号＋and”。