____deep down in the earth ,the dead forests rotted and became coal为什么填Buried不填Having buried

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____deep down in the earth ,the dead forests rotted and became coal为什么填Buried不填Having buried
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____deep down in the earth ,the dead forests rotted and became coal为什么填Buried不填Having buried
____deep down in the earth ,the dead forests rotted and became coal为什么填Buried不填Having buried

____deep down in the earth ,the dead forests rotted and became coal为什么填Buried不填Having buried
having buried本身就不对啊
have done
或者have been doing