题目内容：
Although some countries have taken action to solve the shortage of water, it may be sometime __________ the situation improves.
A.before B.when C.since D.until
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答案解析：
选择题：Although some countries have taken action to solve the shortage of water, it ...
- 题目分类： 英语学科知识与教学能力
- 题目类型：选择题
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