They never knew what __(happen)to the world in a hundred years

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They never knew what __(happen)to the world in a hundred years
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They never knew what __(happen)to the world in a hundred years
They never knew what __(happen)to the world in a hundred years

They never knew what __(happen)to the world in a hundred years
would happen 主句是过去时 从句应用过去时,但有in a hundred years
所以用过去将来时

would happen
主句谓语是knew从句用过去将来时

would happen