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
On no account () ever leave the baby at home alone.

A. should you
B. you should
C. shall you
D. you shall
单项选择题
31().

A.Whichever
B.Whatever
C.Everywhere
D.However
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