as的词性和省略

请问老师在这个句子 My wife and I, as arranged, went to the United Kingdom for sightseeing last summer. 中 as的词性是什么？as之后省略了什么？谢谢!

as arranged= as had been arranged，as指主句表达的内容。《英语As的用法研究》有以下说明：

as所引导的从句中谓语如为be+过去分词，be常可省略，只留过去分词，但带有情态动词则不能省略。

As has been said before, grammar is not a set of dead rules.从前讲过，语法并不是一套死规则。

= As said before, grammar is not a set of dead rules.

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