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


解析:

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

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E  
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