Although I majored in English, language became a challenge when I set foot in the USA for the first time.
A. luckily
B. naturally
C. surprisingly
D. gradually
网友回答
A. luckily
B. naturally
(答案→)C. surprisingly
D. gradually
解析： A. luckily幸运地，B. naturally自然地，C. surprisingly令人惊讶地，D. gradually逐渐地，句意：虽然我主修英语，当我第一次踏上美国的时候，语言出乎意外的成为一个挑战。选C。