It is so thoughtful of you to ask me, but unfortunately I have a rather important previous engagement on that day.
您对我的邀请真是想得周到。但不巧的是，那一天我预先已有重要的约会。
I'd love to, but I'm afraid I have a previous engagement.
我很宁愿答应往，但生怕已跟他人事前有约。
It is very kind of you to invite me, but I have got a previous engagement.
谢谢你的盛情邀请，但我早已有约会。
It is very kind of you to invite me, but I have got a previous engagement.
谢谢你的盛情邀请，但我早已有约会。
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