In gesture to help preserve history, the locals are repairing large percentage of the historic sites steadily.
A. the; the
B. a; a
C. the; a
D. /; the
网友回答
A. the; the
(答案→)B. a; a
C. the; a
D. /; the
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。