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单项选择题

Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.

A．being combined
B．having combined
C．to combine
D．combined
相关考题

There is no person ______ is always in the right.A．whoB...

单项选择题There is no person ______ is always in the right.

A．who
B．that
C．which
D．whom

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