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
The need to go to college is realized, ______ offers opportunities for better careers.
A．which
B．that
C．and
D．with
单项选择题
The governmental departments concerned are aware that there are downfalls ______ more cars on the roads.
A．to have
B．having
C．to having
D．on having
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