As one of them said it the experiment went well.
错误在于多了 it。said 后应加逗号:
As one of them said, the experiment went well.
这样,the experiment went well 是主句,As one of them said 是从句(传统语法叫定语从句;现代语法叫比较从句),as 带有比较意义(正如,正像),且做了 said 的宾语。
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