No one knows what (happen)in 100 years in 100 years是指过去还是现在

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No one knows what (happen)in 100 years in 100 years是指过去还是现在
No one knows what (happen)in 100 years in 100 years是指过去还是现在

No one knows what (happen)in 100 years in 100 years是指过去还是现在
是指将来,in+时间段表示……后,所以应该填will happen.