单项选择题

When you cross the street, you can never be ______ careful.

A．much
B．very
C．too
D．so
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单项选择题
The forest guards often find campfires that have not been ______ completely.
A．turned down
B．put out
C．put away
D．turned over
单项选择题
--I wish I had succeeded in competitions. -- Yeah, I know. But ______ hard
A．did you work
B．do you work
C．had you worked
D．have you worked
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