问题补充：
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
答案：
A. is washing away
B. is being washed away
C. are washing away
(答案→)D. are being washed away
解析：考查时态，句子主语是huge quantities of good earth意思“大量的土壤”，土壤被流失，所以用被动语态，因为是动作正在发生，所以用进行时，所以选D，句子意思“随着较多的森林被破坏，大量的土壤正在被流失”
