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改kind为kinds
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单项选择题
A．Tennis.B．Swimming.C．Table tennis.
A．Tennis.
B．Swimming.
C．Table tennis.
单项选择题
According to the passage the new telephone communication system ______.
A．has been put into actual use
B．was put into actual use in 1977
C．was put on experiment in 1977
D．had been repeatedly experimented on before 1977
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