With more forests being destroyed, huge quantities of good earth each year, which that our environment is suffering.
A. are washing away, suggest
B. is being washed away, suggest
C. have been washed away, suggests
D. are being washed away, suggests
网友回答
A. are washing away, suggest
B. is being washed away, suggest
C. have been washed away, suggests
(答案→)D. are being washed away, suggests
解析：根据句意每年都有好的土地流失，故用现在进行时态的被动式；第二空是定语从句，先行词是整个句子故谓语动词用单数。故选D。