这个句子中第一个that和第二个that都是宾语从句吗？

Question

you're so certain that a writing assignment has to be boring that you deliberately chose a subject that bores you.

Answer 1

第1个that引导的是宾语从句
判断的标志是
that在句中
只作连接成分
是不译的
第2个that和certain前面的so
构成固定搭配
so… that…
译为：如此…以至于…
因此第二个that引导的
不是宾语从句

Answer 2

不对。第一个that引起的是宾语从句。第二个that是结果状语从句（so certain ... that you deliberately chose...) 。追答

第三个that是关系代词，引起定语从句，修饰 subject。

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Answer 3

you're so certain that(that引导结果状语从句) a writing assignment has to be boring that（that引导定语从句）you deliberately chose a subject that bores you.

怎么想成宾语从句了？