The water will be further polluted unless some measures ________.
A.will be takenB.are takenC.were takenD.had been taken在线课程B
解析:
主句为一般将来时,unless引导的条件状语从句通常用一般现在时表示将来,而“措施”应该是“被采取”,故用被动语态。
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