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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