单项选择题

You had better ______ a doctor as soon as possible.

A．seeing
B．saw
C．see
D．seen
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单项选择题
Don't forget ______the window before leaving the room.
A．to have closed
B．to close
C．having closed
D．closing
单项选择题
It is ______for a person in his position to make such a mistake.
A．rare
B．less
C．little
D．few
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