Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
| A．genuine | B．slight | C．solid | D．violent |
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Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
| A．genuine | B．slight | C．solid | D．violent |
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