题目内容

If  we ___________some measures, we might have prevented the environmental pollution.
A．takeB．had takenC．tookD．have taken
B
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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