单项选择题

Physics is the present day equivalent of () used to be called natural philosophy, from () most of present day science arose.

A. which, what
B. that, which
C. what, which
D. what, that

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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
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
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