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

Having ______ so many obstacles, she established her fame as a first-rate actress at last.

A．removed
B．surmounted
C．resumed
D．harnessed

单项选择题

I' d rather you ______ by train because the weather forecast said there would be heavy snow tomorrow.

A．went
B．should go
C．will go
D．go

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