Beijing's first unmanned subway trains, which can run ______ without the control of any drivers, are expected to be put into operation next year.
| A．regularly | B．deliberately |
| C．automatically | D．desperately |
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Beijing's first unmanned subway trains, which can run ______ without the control of any drivers, are expected to be put into operation next year.
| A．regularly | B．deliberately |
| C．automatically | D．desperately |
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