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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

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

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

（2010·江蘇大豐高級中學高三第一次質量檢測） 35. 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