[解析]
Dear John,
Thank you very much for your invitations to dinner in your home tomorrow evening.It's been a long time since that we last met.Unfortunate,it is much to my regret that I cannot join you.I will be fully occupying in preparing for an importance lecture coming the day after tomorrow.I feel terribly sorry for missing∧chance for a get﹣together,and I hope that you'll have a good time with me.Maybe you and me can meet sometime next weekend.If so,please calling me when you get this letter.I think it was great to have a long chat with you.
Sorry again.
详解:
1.invitations改为invitation 考查名词.此处"邀请"只有一份,应用单数形式.
2.去掉that 考查连词.在英语中,两个单句只要一个连词,已有连词since,that是多余的,要去掉.
3.Unfortunate改为Unfortunately 考查副词.修饰句子要用副词.
4.occupying改为occupied 考查固定搭配.be occupied in意为"使忙碌于,使从事于",是固定搭配.
5.importance改为important 考查形容词.lecture是名词,其前用形容词修饰作定语.
6.加the 考查冠词.chance后有介词短语for a get﹣together作后置定语,加the表示特指.
7.with改为without 考查介词.根据句意:我希望你没有我会玩得高兴.用介词without.
8.me改为I 考查代词.and是并列连词,它前后连接两个相同的语法成分,you和I是并列主语,都用主格代词.
9.calling改为call 考查句子结构.祈使句中要用动词原形.
10.was改为is 考查动词时态.此处讲述的是一般事实,用一般现在时态.