1. 是的，一般情况下是这样的。arrange之后接that从句表示“商定......；安排......”的意义，从句中的谓语动词常用虚拟语气。如张道真《英语常用动词用法词典》上的例句：

It was arranged that they should leave by the 9:30 train. 已经安排好他们坐9点半钟的火车走。

It has been arranged that you should teach chemistry. 已经商定让你教化学。

2. 但有时也可以不用虚拟语气。如：

It is arranged that he will telephone me. 已商妥（安排好、约定）由他打电话给我。《21世纪英汉汉英双向词典》

It was arranged that the party would gather for lunch in the Royal Garden Hotel. 已经和这一行人说好将在皇家花园宾馆吃午餐。《柯林斯高阶英汉双解学习词典》