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19、Aluminum（鋁）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（鋁）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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