Hope後面的that是不是同位語從句

例句：The police came here in the hope  that they could learn about the cause of the traffic accident.警察來到這希望瞭解交通事故的原因。

考查語法，in the hope 希望that 引導同位語從句，對hope進行解釋説明。

that引導同位語從句，在從句中不做句子成分。主要是要對句子成分進行分析，然後選擇合適的連接詞

hope用作名詞時引導的從句是同位語從句。同位語從句相當於名詞，它對其前的名詞起補充説明或進一步解釋其內容的作用而定語從句的功能相當於形容詞，它對其先行詞起修飾、描述或限制作用。

例句：

She waited in the forlorn hope that he would one day come back to her.她幾乎毫無指望地等待他有一天會回到她的身邊。

I knocked loudly in the vain hope that someone might answer.

我敲門敲得很響，希望有人應聲，卻是徒然。

He asked her again in the vain hope that he could persuade her to come.

他又問了她一次，徒然指望着能説服她來。

He pressed on in the hope that a few others would join him. The tactic paid off.

他硬着頭皮幹下去，希望能有幾個人加入進來。這一招奏效了。