If we ___________some measures, we might have prevented the environmental pollu
题型：不详难度：来源：
If we ___________some measures, we might have prevented the environmental pollution.| A．take | B．had taken | C．took | D．have taken |
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答案
| B |
解析
| 考查时态。句意：我们已经采取了措施，我们应该能阻止环境污染。条件从句中是对过去已完成动作的假设，故用过去完成时态，选B。 |
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