she saw that they had sat down中的that是连词还是从句的什么词?

问题描述:

she saw that they had sat down中的that是连词还是从句的什么词?
能帮我分析下吗?

是宾语从句, that 是引导词( 可省略)
意思; 她看见他们坐下了.
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