All flights______ because of the air traffic control, the passengers had to wait in the hall.
| A．were put off | B．having put off |
| C．having been put off | D．have been put off |
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All flights______ because of the air traffic control, the passengers had to wait in the hall.
| A．were put off | B．having put off |
| C．having been put off | D．have been put off |
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