If you are going to stay in the United States for longer than a(n) visit you may be inte

问题补充：

If you are going to stay in the United States for longer than a(n) visit, you may be interested in learning more about its people and culture.

A. formal

B. regular

C. brief

D. unexpected

答案：

A. formal

B. regular

(答案→)C. brief

D. unexpected

解析：本题考查形容词。句意：如果你要在美国逗留的时间比短暂访问长，您可能有兴趣了解更多它的人民和文化。brief短暂的； 简略的,简短的。