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elementary
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单项选择题
A．To drive the train.B．To stop the train.C．To start the train.D．To send signals.
A．To drive the train.
B．To stop the train.
C．To start the train.
D．To send signals.
单项选择题
A．In a laundry.B．In an elevator.C．In a library.D．In a bakery.
A．In a laundry.
B．In an elevator.
C．In a library.
D．In a bakery.
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