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With the country's population reaching 1.6 billion in the mid of this century, most of China's rivers, including the Yellow River, ________.

A.is drying up 

B.will be drying up

C.dry up 

D.have dried up

B

解析:根据句中的时间状语in the mid of this century再结合语意可知本题应该使用将来进行时表示在将来某一段时间内发生的变化。

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