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用适当的时态填空 Much of the carbon in the Earth from things that once lived．

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用适当的时态填空 Much of the carbon in the Earth from things that once lived．

用适当的时态填空

Much of the carbon in the Earth ________(come)from things that once lived．

试题答案

答案：comes

标签：时态适当thecarbonof

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