Although I majored in English language became a challenge when I set foot in the USA for

问题补充：

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

答案：

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。