2. 外语
  3. Not until actually faced with water scarcity____appreciate the value of water to a region.

Not until actually faced with water scarcity____appreciate the value of water to a region.

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问题 Not until actually faced with water scarcity____appreciate the value of water to a region.
选项 A、one can
B、one cannot
C、can one
D、cannot one
答案C
解析 not until开头的句子，后面应该使用倒装句，所以排除A和B。根据句意“只有真正遇到水资源缺乏，我们才会感激水对一个地区所起的重要作用”，我们可以判断，C选项正确。
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