The mountain ___ ___ ___(形成) one hundred years ago.

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Themountain_________(形成)onehundredyearsago.Themountain_________(形成)onehundredyearsago.Themountain___

The mountain ___ ___ ___(形成) one hundred years ago.
The mountain ___ ___ ___(形成) one hundred years ago.

The mountain ___ ___ ___(形成) one hundred years ago.
came into being.形成