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
I saw no more than one motorcar in that shop. Will you go and buy ______
A．one
B．that
C．them
D．it
单项选择题
Soon after he reached Australia, Captain Cook ______ to draw the map of the .east coast.
A．set about
B．set off
C．set sail
D．set out
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