With the country’s population increasing to 1.3 billion, many of China’s rivers, including the legendary Yellow River, ________．A.is drying upB.will be drying upC.had dried upD.are drying up
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D解析考查动词的时态和主谓一致。用现在进行时，表示河流的干涸正在发生。该句的主语是不定代词many，故谓语动词用复数。