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    _____sharks are heavier than water, they must swim continuously or they will sink to the bottom.

    A. Since　　　　　　　　　　   B.Though　　　　　　　　　　 C.When　　　　　　　　　　    D.Once

     

    答案：A
    解析：

    since可引导原因状语从句。

     


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