Question

It is said____ ____ was all ___ he said.

It is said that that was all that he said.

Answer 1

It is said that it was all that he said.
意思是：据说那就是他说的所有的话。
It is said that是固定句式，“据说……”；后面的it was all that he said是个主语从句（It is said that中的it是形式主语），本来正常的顺序应该是：That it was all that he said is said，但是为了避免句子头重脚轻，所以用了形式主语it，把真正的主语That it was all 放在后面。that he said是定语从句，修饰先行词all（all做先行词时，定语从句引导词只能用that）。
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Answer 2

It is said that it /that was all that he said.

表示最TMD讨厌和鄙视这种不是人话的考试题目。出题的（没说楼主，说试卷哈哈）脑残！！！

Answer 3

It is said that it /that was all what he said.