Usually, we don’t know how important something is ______ we lose it.

         A. or                 B. until             C. as soon as

B

【解析】連詞用法。由連詞until構(gòu)成：not…until… “直到…才…”這里是直到我們丟失了什么菜知道它的重要。所以選擇答案B.

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