单项选择题

Because of the complexity of the modern machine, most offices require secretaries ______.

A．to have specified training
B．specified in training
C．to train specifiedly
D．training specified
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单项选择题
We are convinced ______ the righteousness of our cause.
A．of
B．on
C．over
D．at
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
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