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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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
While doing calculation for the project, the designers ________ a new solution to a geological problem.
A．fell into
B．stumbled upon
C．set out
D．discovered
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