单项选择题

We have to work even harder though we feel quite ______ our success.

A．secure of
B．nervous about
C．worried about
D．competent for
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单项选择题
The newly-built factory can ______ a new brand of bicycle.
A．bring down
B．bring forward
C．bring out
D．bring up
单项选择题
His dedication ______ the cause of education earned him the respect of his colleagues.
A．to
B．about
C．in
D．into
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