问答题 "This is an unbelievably generous response from unbelievably philanthropic set of alumni, parents, and friends. "

【正确答案】第二个unbelievably之前应添加3n
【答案解析】[解析] set一班志趣相投者，一伙年龄相当的人，是可数名词。unbelievably以元音开头，应在前面加an。