单选题 I notified him that the meeting had been postponed.
【正确答案】 A
【答案解析】[解析] 根据带双宾语结构，判断A是答案。而且A在句意“我通知他会议已经被取消了”上也合适。notify“通报”；mock“嘲笑”；mislead“误导”；observe“观察，观测，遵守”。