Question

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

Answer 1

C

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……”。