Usually, we don’t know how important something is we lose it. A. or B. until C. as soon as 题目和参考答案——青夏教育精英家教网——

题目内容

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

A. or B. until C. as soon as

B

【解析】连词用法。由连词until构成：not…until… “直到…才…”这里是直到我们丢失了什么菜知道它的重要。所以选择答案B.

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