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(what) I told you just now was (what) had been written in th

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(what) I told you just now was (what) had been written in the letter.
第一个what是因为句子中缺少主语成分,我知道;不明白第二个what.是因为be动词后的宾语从句一定要用what吗?请从专业角度解释为什么不用that啊.
(what) I told you just now was (what) had been written in th
第一个what是连接代词 引导主语从句 并作 从句中的直接宾语
第二个what是连接代词 引导表语从句 并作 从句中的主语.
不用that是因为 that 引导表语从句时不能 充当 从句中的句子成分.