15、The last eruption of the Yellowstone Volcano ________ the mountains and valleys that visitors can see today in Yellowstone．

A．developed               B．destroyed                C．invented                  D．formed

15、D

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The last eruption of the Yellowstone Volcano ________ the mountains and valleys that visitors can see today in Yellowstone．

A．developed               B．destroyed                C．invented                  D．formed

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