If we some measures we might have prevented the environmental pollutionA. takeB. had tak

问题补充：

If we some measures, we might have prevented the environmental pollution．

A. take

B. had taken

C. took

D. have taken

答案：

A. take

(答案→)B. had taken

C. took

D. have taken

解析：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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