If  we ___________some measures, we might have prevented the environmental pollution.
A．takeB．had takenC．tookD．have taken
B
考查時(shí)態(tài)。句意：我們已經(jīng)采取了措施，我們應(yīng)該能阻止環(huán)境污染。條件從句中是對(duì)過(guò)去已完成動(dòng)作的假設(shè)，故用過(guò)去完成時(shí)態(tài)，選B。
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