With more forests being destroyed, huge quantities of good earth each year.
A. is washing away
B. is being washed away
C. are washing away
D. are being washed away
网友回答
A. is washing away
B. is being washed away
C. are washing away
(答案→)D. are being washed away
解析：动词短语的被动形式。wash away 冲走；句意：每年大量的优质土壤被冲走！