问题
选择题
Some people never know what they need ______ they lose it.
A. until B. as C. after
答案
答案：A
题目分析：until直到，as当，after在……之后，句意：一些人直到丢失了什么才知道他们需要什么。故选A。
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Some people never know what they need ______ they lose it.
A. until B. as C. after
答案：A
题目分析：until直到，as当，after在……之后，句意：一些人直到丢失了什么才知道他们需要什么。故选A。