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    they become dirty, the lakes are not able to clean themselves A. Once B. since C. As D Because 【查看更多】

     

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    ________ they become dirty, the lakes are not able to clean themselves

    A. Once        B. Since         C. As         D. Because

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    ________ they become dirty, the lakes are not able to clean themselves

    A. Once 　　　 B. Since　　　　 C. As　　　　 D. Because

     

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