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
They have considered their high standard of living a(n) ______ for practising their basic beliefs.
A．award
B．reward
C．result
D．consequence
单项选择题
Tom ______ his new job with confidence.
A．set out
B．set off
C．set up
D．set about
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