题目

With the contry'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 答案： B   考查时态。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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