单项选择题

If you carefully ______ the problem again, you will find a way out.

A．think over
B．take over
C．set up
D．look up
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单项选择题
Children are encouraged to ______ their feelings of sadness that they may be holding inside.
A．say
B．express
C．give
D．talk
单项选择题
As I ______ down the street, I noticed a police car parking at the corner.
A．walked
B．had walked
C．would walk
D．was walking
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