单项选择题

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

A. combine



B. combined
C. being combined


D. having combined
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单项选择题
I would rather I ______ to the party yesterday evening.
A. not go



B. no go
C. had not gone


D. wouldn’t gone
单项选择题
______ plastics, the machine is light in weight.
A. Made of


B. Having made with
C. To make of


D. To be made of
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