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If nothing________,the oceans will turn into fish deserts.              (2013·湖南,26)
A.doesB.had been done
C.will doD.is done
D

考查动词的时态和语态。句意为:如果什么都不做的话,海洋将会变成鱼的沙漠。根据“主将从现”的原则,从句用一般现在时。再根据语境可知此处表示被动。故选D项。
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