单项选择题

A．Gasoline.
B．Horses.
C．Steam.
D．Oil.
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单项选择题
A．The train is crowded.B．The train is empty.C．The train is late.D．The train is leaving.
A．The train is crowded.
B．The train is empty.
C．The train is late.
D．The train is leaving.
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