In _______ gesture to help preserve history, the locals are repairing _______ large percentage of the historic sites steadily.A.the; theB.a; aC.the; aD./; the
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B解析考查固定短语和冠词。句意“为了保护历史，当地居民正在修复一大批历史古迹。”in a gesture to do sth.“为了做某事”，是固定搭配；排除A、C；泛指一大批用a large percentage of...。故选B。