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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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
单项选择题
The American professor came to realize that he had underestimated the ________ of most of the Chinese students.
A．magnitude
B．gradient
C．potential
D．firmness
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