单项选择题

Nowhere in nature is aluminum found free, owing to it 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
Although ______ American literature, he failed to remember the writer of the masterpiece.
A．he was knowing
B．he is knowing
C．knows
D．having a knowledge of
单项选择题
The earnings of women are well below that of men ______ educational differences that are diminishing between the two sexes.
A．although
B．though
C．despite of
D．in spite of
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