His colleague can split water into hydrogen and oxygen when_____(place) into a bucket of water这里为什么填placed呢?为什么it is 没有了?

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His colleague can split water into hydrogen and oxygen when_____(place) into a bucket of water这里为什么填placed呢?为什么it is 没有了?
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His colleague can split water into hydrogen and oxygen when_____(place) into a bucket of water这里为什么填placed呢?为什么it is 没有了?
His colleague can split water into hydrogen and oxygen when_____(place) into a bucket of water
这里为什么填placed呢?
为什么it is 没有了?

His colleague can split water into hydrogen and oxygen when_____(place) into a bucket of water这里为什么填placed呢?为什么it is 没有了?
用被动是因为是hydrogen and oxygen 被placed,省略了it is ,语法上省略it is

省略了it is

用被动是因为是hydrogen and oxygen 被placed