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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单项选择题
One of the sides of the board should be painted yellow, and ______.
A．the other is white
B．another white
C．the other white
D．another is white
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
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