单选题 Sometimes Americans are said to be______. Perhaps it seems so, but they are probably just having a good time. Just like anywhere else, it takes time to become real friends with people in the U.S.
【正确答案】 D
【答案解析】解析：句意是，有时美国人表面上很友好。可能是这样，但他们可能正值好心情。像在其他地方一样，与美国人成为真正的朋友需要花费时间。friendly友好的，为形容词，根据副词修饰形容词的原则，所以正确答案为D。