that是代词，可以作宾语，具体内容如下。
宾语，又称受词，是指一个动作的接受者，可由名词、代词、数词、名词化的形容词、不定式、动名词、宾语从句等来担任。
宾语分为直接宾语、间接宾语同源宾语等，其中直接宾语指动作的直接对象，间接宾语说明动作的非直接，但受动作影响的对象。
可以的，当“那.....”讲，代表某物或者某事的时候例如，I don't think you like that.(虽然连接词是that，此处已经省略，但是从句中仍然可以出现，只是意义不同)
That作为宾语
That在句中可以作为宾语
例如：
Jennifer hinted that she would be late for class.
Doug knew that he needed to hurry up.
The teacher suggested that we finish our homework.
That在关系从句中作为宾语
That在关系从句中作为宾语时一般加与不加that都可以
例如：
He invited the boy （that） he met on the train.
Shelly purchased the chair （that） she had seen at the auction.
Alfred wants to read the book （that） Jane recommended.
That作为主语
That可以在句中作为主语，此时使用that一般表示稍微正式些，在口语中并不常用。
例如：
That it is so difficult is hard to understand.
That Mary feels so sad is very upsetting.
That our teacher expects us to do two hours of homework every day is crazy
