单项选择题

The research unit aims to help people to ______.

A．invent complete electronic equipment
B．become physically independent
C．gain confidence about themselves
D．master difficult problems
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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
单项选择题
There is ______ knowing what may happen in a war.
A．no
B．not
C．nothing
D．none
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