Not until the heavy snow blocked the express how serious the weather was. A. the villager

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A. the villagers did realize
B. the villagers realized
(答案→)C. did the villagers realize
D. didn’t the villagers realize
解析：考查倒装句：句意：直到大雪堵塞了高速公路，村民才意识到天气多么的严重。Not until+时间状语从句放在句首，从句用部分倒装，助动词did放在主语前面，选C。