Once          a difficult and even dangerous place , Vietnam is now a friendly detestation that welcomes visitors from all over the world        .
A．considered; visiting B．considered; to visit
C．considering; visiting D．considering; to visit
B

試題分析：考查狀語從句的省略句和不定式：句意：雖然曾被認(rèn)為不適宜旅游甚至危險，現(xiàn)在越南已是全世界游客的目的地。當(dāng)主從句的主語一致的時候，可以省略從句的主語和be動詞，這句話完整的是Once vienam is considered a difficult and even dangerous place,可以省略主語和be動詞，所以填considered，第二空是詞組welcome sb to do sth歡迎某人做…，選B。
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