All flights ___________ because of fog. I’m afraid you will have to stay here for another day.
| A．had been put off | B．called off |
| C．have been called off | D．have put off |
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All flights ___________ because of fog. I’m afraid you will have to stay here for another day.
| A．had been put off | B．called off |
| C．have been called off | D．have put off |
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