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    31．Once a difficult and even dangerous place .Vietnam is now a friendly destination that welcomes visitors from all over the world. A. considered; visiting B. considered; to visit C. considering; visiting D. considering; to visit 【查看更多】

     

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    Once______ a difficult and even dangerous place______，Vietnam is now a friendly destination that welcomes visitors from all over the world.

    A. considered; visiting                   B. considered; to visit 

    C. considering; visiting                  D. considering; to visit

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