dated January 3 为过去分词词组,（由于表示被动含义,故用过去分词）作后置定语,意义相当于一个定语从句,可转换成We thank you for your letter that/which was dated January 3.
此规则是英语里一个很常见的语法现象,请理解记住!
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We thank you for your letter DATED January 3.
这里的dated是过去分词么 是过去分词在里边做宾语补语么 还是过去分词做定语.
dated January 3 为过去分词词组,（由于表示被动含义,故用过去分词）作后置定语,意义相当于一个定语从句,可转换成We thank you for your letter that/which was dated January 3.
此规则是英语里一个很常见的语法现象,请理解记住!
赞同请采纳!