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
C
考查時(shí)態(tài)和非謂語(yǔ)動(dòng)詞。since the 1980’s是現(xiàn)在完成時(shí)的標(biāo)志,根據(jù)語(yǔ)境應(yīng)該用被動(dòng)形式；stop sth.from being done是“阻止……被做……”。
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