Enough to stop the forest since the 1980’s.A. has been done;be cut downB. has done;cutting

问题补充：

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

答案：

A. has been done;be cut down

B. has done;cutting down

(答案→)C. has been done;being cut down

D. had done;from being cut down

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……”。