摘要：29．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
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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
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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
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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 river________so seriously now.
A．is not polluted B．would not be polluted
C．had not been polluted D．would not have been polluted
查看习题详情和答案>>