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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 【查看更多】

     

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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

     

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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

     

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


    1. A.
      Since
    2. B.
      Though
    3. C.
      When
    4. D.
      Once

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