题目内容

If  we ___________some measures, we might have prevented the environmental pollution．
A．takeB．had takenC．tookD．have taken
B
考查虚拟语气。与过去事实相反时，从句用过去完成时，主句用情态动词+have done.句意：如果我们采取了一些措施，我们也许就可以阻止环境污染。
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