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 awayD．a(chǎn)re being washed away
D
動詞短語的被動形式。wash away 沖走；句意：每年大量的優(yōu)質(zhì)土壤被沖走！
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