单项选择题


A．and
B．when
C．then
D．before
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单项选择题
A．OneB．ItsC．ThisD．That
A．One
B．Its
C．This
D．That
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
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