单项选择题

The disappearance of her paper has never been ______.

A．counted for
B．looked up
C．accounted for
D．checked up
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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
They have considered their high standard of living a(n) ______ for practising their basic beliefs.
A．award
B．reward
C．result
D．consequence
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