【题目】Not until recently _______the development of tourist-related activities in the rural areas.
A. had they encouraged B. they had encouraged
C. they encouraged D. did they encourage
在线课程【答案】D
【解析】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。not until位于句子开头句子用部分倒装，部分倒装即只把谓语的一部分（如助动词、情态动词等）放到主语前，或把句子的强调成分提前。根据句意可知用一般过去时态，故D正确。