“非常成功”常见的英文表达有 highly successful、extremely successful 或 very successful。具体使用哪个可根据语境和表达偏好选择：
Highly successful：强调成就或成果的高度认可，常用于正式或专业场合。
例句：The project was highly successful, exceeding all our expectations.（该项目非常成功，超出了我们的预期。）
Extremely successful：突出成功的程度极高，语气稍强。
例句：Her new business has been extremely successful in its first year.（她的新公司在第一年就取得了巨大的成功。）
Very successful：通用表达，适用于日常对话或非正式场合。
例句：The concert was very successful, with a full house.（音乐会非常成功，座无虚席。）
根据语境选择最合适的表达即可。