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    The water in the river nearby will be dirtier than before if nothing __________.

    A. has done B. will be done

    C. is done D. was done

     

    C

    【解析】

    试题分析：句意:如果什么措施也不采取的话，附近河里的水将会比以前更脏。if如果，引导条件状语从句，从句中用一般现在时表示将来；并且从句中的主语nothing和动词do之间构成被动的关系，应该用被动语态，故选C。

    考点：考查动词的时态和语态。

     

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