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With more forests being destroyed, huge quantities of good earth      each year.
A.is washing awayB.is being washed away
C.are washing away D.are being washed away
D
考查主谓一致。quantities of+名词作主语时,谓语动词要和quantities保持一致,要用复数形式,所以排除A,B;且earth和wash away是动宾关系,所以要用被动语态。选D。
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