Enough _______ to stop the forest _______ since the 1980’s.
A.has been done; be cut down
B.has done; cutting down
C.has been done; being cut down
D.had done; from being cut down
网友回答
C解析考查时态和非谓语动词。since the 1980’s是现在完成时的标志，根据语境应该用被动形式；stop sth. (from) being done是“阻止……被做……”的意思。