We cannot accurately predict how much carbon dioxide（ ）by factories will remain permanently in the air.
A.正确答案Areleased
B.to release
C.releasing
D.being released
We cannot accurately predict how much carbon dioxide（ ）by factories will remain permanently in the air.
We cannot accurately predict how much carbon dioxide（ ）by factories will remain permanently in the air.
A.正确答案Areleased
B.to release
C.releasing
D.being released
