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    25．The voyages of travelers before the 17th century show that they were not the sea even though they didn’t have modern navigational aids. A．at the expense of B．at the risk of C．in the way of D．at the mercy of 【查看更多】

     

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     The voyages of travelers before the 17th century show that they were not ____ the sea even 
    though they didn't have modern navigational aide.      
    [      ]
    A. at the expense of      
    B. at the risk of     
    C. in the way of      
    D. at the mercy of

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    The voyages of travelers before the 17th century show that they were not ________ the sea even though they didn’t have modern navigational aids．

    [　　]

    A．at the expense of

    B．at the risk of

    C．in the way of

    D．at the mercy of

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