定语从句中先行词

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It will be the beginning of the long process of integration that will ultimately lead to a fully electronic human before the end of the next century.

句中that代指的先行词是integration吗?

是否it be...that 句型中,先行词是前边的表语成分?

还是可能是integration也可能是表语成分? 感谢!

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