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        1. The water in the river nearby will be dirtier than before if nothing __________.
          A.has doneB.will be done
          C.is doneD.was done
          C

          試題分析:句意:如果什么措施也不采取的話,附近河里的水將會(huì)比以前更臟。if如果,引導(dǎo)條件狀語從句,從句中用一般現(xiàn)在時(shí)表示將來;并且從句中的主語nothing和動(dòng)詞do之間構(gòu)成被動(dòng)的關(guān)系,應(yīng)該用被動(dòng)語態(tài),故選C。
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