With more forests being destroyed, huge quantities of good earth      each year.
A．is washing awayB．is being washed away
C．a(chǎn)re washing away D．a(chǎn)re being washed away
D
考查主謂一致。quantities of+名詞作主語時，謂語動詞要和quantities保持一致，要用復(fù)數(shù)形式，所以排除A,B；且earth和wash away是動賓關(guān)系，所以要用被動語態(tài)。選D。
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