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2010·北京海淀·一模
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1 . If we had taken such effective measures much earlier, the river          so seriously now.
A.is not pollutedB.would not be polluted
C.had not been pollutedD.would not have been polluted
2016-11-26更新 | 598次组卷 | 5卷引用:北京市海淀区2010届高三下学期统一练习
共计 平均难度:一般