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(2013·高考湖南卷)If nothing________,the oceans will turn into fish deserts.
A.doesB.had been done
C.will doD.is done
D
选D。题干的意思是:“如果什么措施都不采取的话,海洋将会变成鱼类的沙漠。”根据“主将从现”的原则,即主句为一般将来时,从句用一般现在时,再根据语境可知此处应用被动语态,故答案为D。
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