单项选择题


A．course
B．flight
C．orbiting
D．passage
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单项选择题
A．to playB．having playedC．playingD．to have played
A．to play
B．having played
C．playing
D．to have played
单项选择题
A．universeB．sphereC．realmD．space
A．universe
B．sphere
C．realm
D．space
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