单项选择题

For some time now, Eric ______ for foreign trade.

A．had been working
B．was working
C．has been working
D．worked
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单项选择题
There is ______ knowing what may happen in a war.
A．no
B．not
C．nothing
D．none
单项选择题
He has admitted his mistakes ______.
A．in a public
B．in the public
C．in public
D．in publics
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