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    We don’t know how important something is _______ we lose it.

    A. or B. until C. as soon as D. after

    B 【解析】句意：我们不知道什么东西有多重要，直到失去它。考查固定搭配。A. or或者；B. until直到；C. as soon as一…就…；D. after在…之后。根据句意结合关键词don’t ，可知判断出此句应用固定表达“not…until” 来完成，意为“直到…才”引导一个时间状语从句，故答案选B。
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