Something must be done to prevent our ci
题型:选择题
问题:
Something must be done to prevent our city ____ by thick smoke.
A.to be polluted
B.from polluting
C.from being polluted
D.polluting
Something must be done to prevent our city ____ by thick smoke.
A.to be polluted
B.from polluting
C.from being polluted
D.polluting