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    If nothing______, the oceans will turn into fish deserts.

    A．does B．had been done C．will do D．is done

    D

    解析试题分析：句意：如果没有什么可以做，海洋将会变成鱼的沙漠。因为主句是一般将来时，if引导的条件句用一般现在时代替一般将来时，所以选D。
    考点：考查时态语态

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