Not until recently_________the development of tourist-related activities in the rural areas.

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问题 Not until recently_________the development of tourist-related activities in the rural areas.

选项 A、they had encouraged
B、had they encouraged
C、did they encourage
D、they encouraged

答案C

解析 句意:直到最近他们才鼓励在农村地区开展与旅游有关的活动。“Not until”置于句首时,句子要部分倒装,需添加助动词do、does或did,并将其置于主语之前。根据语境可知,这里应使用一般过去时,因此本题选C。
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