Question

As has been announced，we shall have our exams next week. 其中as是什么意思

Answer 1

As（正如） has been announced，we shall have our exams next week. (插入语结构)
==It has been announced that we shall have our exams next week. （主语从句）
===That we shall have our exams next week has been announced (by the school).（主语从句）
===we shall have our exams next week,which has been announced (by the school).（定语从句）
=== What has been announced (by the school) is that we shall have our exams next week. （表语从句）

Answer 2

正如被宣布的那样我们下周考试。所以As 在这里是正如的意思。