If we had taken such effective measures much earlier, the river________so seriously now.
A.is not polluted | B.would not be polluted |
C.had not been polluted | D.would not have been polluted |
推荐套卷
If we had taken such effective measures much earlier, the river________so seriously now.
A.is not polluted | B.would not be polluted |
C.had not been polluted | D.would not have been polluted |