Though a difficult and even dangerous place , Vietnam is now a friendly destination that weles visitors from all over the world .
A. considered; visiting
B. considered; to visit
C. considering ; visiting
D. considering; to visit
网友回答
A. considered; visiting
(答案→)B. considered; to visit
C. considering ; visiting
D. considering; to visit
解析：考查过去分词短语做状语，句意：虽然越南被认为是困难的甚至危险的地方，但是它现在是友好的旅游目的地，欢迎来自世界各地的游客参观。因为动词consider和句子的主语Vietnam之间是被动关系,所以要用表被动的过去分词,第二空考查的是wele sb to do sth，选B。