问题描述：
虚拟语气问题
If we had taken such effective measures much earlier, the river _____ so seriously now. would not have been polluted 还是would not be polluted 为什么?
If we had taken such effective measures much earlier, the river _____ so seriously now. would not have been polluted 还是would not be polluted 为什么?
问题解答：
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