单项选择题

A．to play
B．having played
C．playing
D．to have played
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单项选择题
A．courseB．flightC．orbitingD．passage
A．course
B．flight
C．orbiting
D．passage
单项选择题
A．inventingB．planningC．devisingD．plotting
A．inventing
B．planning
C．devising
D．plotting
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