It is thought that one billion people in the world,___is half the world's workers,earn their living by farming为什么填that?

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It is thought that one billion people in the world,___is half the world's workers,earn their living by farming为什么填that?

that是代词,指代one billion people,所引导的从句补充说明one billion people.

不能用that,用which
非限制性定语从句.用which

that is...固定用法,表示:即,那就是