按规律填空 three______ ______twelve______eighteen

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按规律填空three____________twelve______eighteen按规律填空three____________twelve______eighteen按规律填空three______

按规律填空 three______ ______twelve______eighteen
按规律填空 three______ ______twelve______eighteen

按规律填空 three______ ______twelve______eighteen
three---six---nine---twelve---fifteen---eighteen