单项选择题

Some of the scientists assert that there is ______ UFO in the world.

A．no such thing as
B．no such thing as an
C．no such a thing as a
D．no such thing as a
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单项选择题
He discovered that ______ old friend of his was one of ______ members of the jury at his trial.
A．an, the
B．an, /
C．the, the
D．/, /
单项选择题
In the U. S. , it is common that each state ______ its power to an elected or appointed state board of education.
A．exercises
B．applies
C．adjusts
D．delegates
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