【题目】Not until recently _______the development of tourist-related activities in the rural areas.
A. they had encouraged B. had they encouraged
C. did they encourage D. they encouraged
在线课程【答案】C
【解析】试题分析：考查部分倒装。句意：直到最近他们才鼓励在农村地区开展与旅游业有关的活动。当not until所引导的时间状语放在句首时，主句要使用部分倒装。故C项正确。