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
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
单项选择题
Having been discussed, the proposal was ________ unanimously.
A．adapted
B．adopted
C．admitted
D．adjoined
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