Many new means__________ to prevent the river ____________.
A. have found, from polluting
B. have found, from being polluted
C. have been found, from being polluted
D. has been found, from being polluted
Many new means__________ to prevent the river ____________.
A. have found, from polluting
B. have found, from being polluted
C. have been found, from being polluted
D. has been found, from being polluted
C