单选题 Betty was offended because she felt that her friends had ignored her purposefully at the party.
【正确答案】 D
【答案解析】[解析] 本题的四个选项都是副词。D项的意思是“故意地”，与“purposefully有目的地，蓄意地”意思相吻合。A项“拼命地，失望地”、B项“明确地”、C项“决然地，果断地”都与题干中的词义不符。