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  3. Although some countries have taken action to solve the shortage of water, it may be some time______the situation improves.

Although some countries have taken action to solve the shortage of water, it may be some time______the situation improves.

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问题 Although some countries have taken action to solve the shortage of water, it may be some time______the situation improves.
选项 A、before
B、when
C、since
D、until
答案A
解析 考查连词。句意为“尽管一些国家已经采取措施解决水资源短缺的问题，但是可能还要有一段时间，情况才会好转”。before“在……之前”，when“当……时候”，since“自从”，until“直到”。固定句型it may／will be+时间段+before从句表示“还要过多久才……”，故选A。
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