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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