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    19、Aluminum（铝）isn’t found free in nature, owing to its always          with other elements, most commonly with oxygen.

    A．being combined                              B．having combined

    C．combine                                      D．combined

    19、A

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    Aluminum（铝）isn’t found free in nature, owing to its always          with other elements, most commonly with oxygen.

    A．being combined                              B．having combined

    C．combine                                      D．combined

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