If we had taken such effective measures much earlier, the fiver ____ so seriously now.
A.is not polluted B.would not be polluted
C.had not been polluted D.would not have been polluted
If we had taken such effective measures much earlier, the fiver ____ so seriously now.
A.is not polluted B.would not be polluted
C.had not been polluted D.would not have been polluted
B