这里的现在分词短语 inviting her to have a visit 显然是后置定语啊,修饰 a letter,意思是“邀请她去参观的信件”。相当于:She received a letter from a school that / which invited her to have a visit.
She received a letter from a school inviting her to have a visit.
如果把以上句子的(现在分词短语)改为(定语从句)就是下面句子
【1】She received a letter from a school which invites her to have a visit.
【2】She received a letter which invites her to have a visit from a school .
 
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