_____in the queue for half an hour，the old man suddenly realized he had left the cheque in the car.
| A．Waiting | B．To wait | C．Having waited | D．To have waited |
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_____in the queue for half an hour，the old man suddenly realized he had left the cheque in the car.
| A．Waiting | B．To wait | C．Having waited | D．To have waited |
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