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【参考答案】

adequate
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单项选择题
A．To drive the train after it is started automatically.B．To start the train and drive it when necessary.C．To take care of the passengers in the train.D．To send commanding signals to the command spot.
A．To drive the train after it is started automatically.
B．To start the train and drive it when necessary.
C．To take care of the passengers in the train.
D．To send commanding signals to the command spot.
单项选择题
A．Waved their hands.B．Shout and cried.C．Waved their shirts.D．Made a fire.
A．Waved their hands.
B．Shout and cried.
C．Waved their shirts.
D．Made a fire.
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