請問以下幾句哪一個最正確/ 較有禮貌? 或有其他更好的寫法?
xxx先生將不能參予會議,因為他在18/2到20/2期間會在上海(不在香港)。
1) Mr. XXX is not attending the meeting as he will be in Shanghai from 18/Feb to 20/Feb.
2) Mr. XXX will not attend the meeting as he will be in Shanghai from 18/Feb to 20/Feb.
3) Mr. XXX could not attend the meeting as he will be in Shanghai from 18/Feb to 20/Feb.