单项选择题

A．At midnight.
B．In the morning.
C．When the neighbors’ son leaves for work.
D．When the car is turned off.
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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.
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.
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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