If  we ___________some measures, we might have prevented the environmental pollution．
A．takeB．had takenC．tookD．have taken
B
考查虛擬語(yǔ)氣。與過去事實(shí)相反時(shí)，從句用過去完成時(shí)，主句用情態(tài)動(dòng)詞+have done.句意：如果我們采取了一些措施，我們也許就可以阻止環(huán)境污染。
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