单项选择题

The problem has been（）my mind all day.

A. preying on
B. getting at
C. taking on
D. seeing to

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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

Sometimes（）matters may result in surprising large effects.

A. predictable
B. big
C. trivial
D. imaginable

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