She turned down the invitation to the party as she had a(an) (

She turned down the invitation to the party as she had a(an) ( )at the office with a new client.
A、appointment
B、arrangement
C、assignment
D、promise
【正确答案】：A
【题目解析】：考核词义辨析，appointment 约会，约见; arrangement 安排；assignment 任务；promise 承诺。句子含义是她拒绝了邀请，因为和新客户早有约定。