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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中学英语

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