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【题目】If nothing ______, the oceans will turn into fish deserts.

A.is doneB.has doneC.will be doneD.does

【答案】A

【解析】

考查动词时态语态和主谓一致。句意:如果不采取措施,海洋将变成鱼类沙漠。从句中主语与谓语动词构成被动关系,且主句为一般将来时,则条件状语从句中需用一般现在时表将来时,且主语为nothing,谓语动词应用第三人称单数is。故选A

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