29.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 |
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29.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 |