单项选择题

A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Computers began controlling the trains on the line.
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单项选择题
A．To return the video to the professor.B．To get the video from the professor.C．To hand in an assignment to the professor.D．To discuss handouts with the professor.
A．To return the video to the professor.
B．To get the video from the professor.
C．To hand in an assignment to the professor.
D．To discuss handouts with the professor.
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A．They are boiling a cup of water.B．They are stirring a cup of mud.C．They are cooking sweet and sour rice.D．They are writing down the recipe.
A．They are boiling a cup of water.
B．They are stirring a cup of mud.
C．They are cooking sweet and sour rice.
D．They are writing down the recipe.
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