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

考查时态和语态。首先nothing与do之间为被动关系,排除A、C两项;根据主句的一般将来时态可知,if引导的条件状语从句使用一般现在时态。故选D。
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