The passage tells us that London’s first Light Rail System ______ The trains on the DLR are controlled by ______

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问题 The passage tells us that London’s first Light Rail System ______
The trains on the DLR are controlled by ______

选项 A、an on-board central computer.
B、a computer engineer on board.
C、two-way radios operated by the drivers.
D、a computer center based somewhere along the line.

答案A

解析
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