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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单项选择题
According to the acoustics, continual exposure ________ noise of high intensity would lead to loss of hearing.
A．of
B．with
C．to
D．by
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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