单项选择题

To meet the ever increasing demand ________ oil - refining equipment, the company will produce more of such equipment.

A．of
B．on
C．with
D．for
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单项选择题
At her word she stood up and walked away, stopping at the window to pull back the curtain and ________.
A．look round
B．look out
C．look up
D．look on
单项选择题
We are convinced ________ the righteousness of our cause.
A．of
B．on
C．over
D．at
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