单项选择题

A．live
B．dead
C．working
D．recording
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单项选择题
A．receivingB．sendingC．receiveD．send
A．receiving
B．sending
C．receive
D．send
单项选择题
A．terminatingB．continuingC．continuesD．terminates
A．terminating
B．continuing
C．continues
D．terminates
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