单项选择题

It's important to remember that nutrients have to work ______, and to take too much of one or another can be useless or even dangerous.

A．in check
B．in retrospect
C．in concert
D．in vogue
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单项选择题
I want to ______ a slightly different issue which is related to Anna's question earlier about our different meanings of open-ended problems.
A．bring up
B．bring about
C．bring forward
D．bring out
单项选择题
She ______ maintained that her grandsons were innocent, and nothing could dissuade her from that belief.
A．skeptically
B．correspondently
C．hesitantly
D．steadfastly
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