单项选择题

A．She is the director of the group.
B．She is playing the piano.
C．She is playing the violin.
D．She is playing the bass.
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单项选择题
A．About the cost of living.B．About their safety.C．About pollution.D．About traffic jams.
A．About the cost of living.
B．About their safety.
C．About pollution.
D．About traffic jams.
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