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
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单项选择题
That fellow ______ at long distance running.
A．excels
B．exceeds
C．surpasses
D．overtakes
单项选择题
Clothing made of plastic fibres has certain advantages over ______ made of natural fibres like cotton, wool, or silk.
A．one
B．the one
C．that
D．what
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