31．—Can you tell me what time the flight to Detroit leaves?
—I'm sorry, but it ______．
| A．has been canceled | B．had been canceled |
| C．has canceled | D．had canceled |
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31．—Can you tell me what time the flight to Detroit leaves?
—I'm sorry, but it ______．
| A．has been canceled | B．had been canceled |
| C．has canceled | D．had canceled |
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