单项选择题

The old man is used to ______ early in the morning.

A．exercise
B．exercising
C．exercised
D．exercises
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单项选择题
You had better ______ a doctor as soon as possible.
A．seeing
B．saw
C．see
D．seen
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
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